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Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)
Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

Protect your investment in diesel power and confidently extend drain intervals with our top-grade synthetic diesel oil. AMSOIL Signature Series Max-Duty Synthetic Diesel Oil delivers 6X better wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222. Advanced synthetic technology provides excellent viscosity control and outstanding extreme-temperature performance, while minimizing oil consumption. The result: protection that’s boosted to the max.

Package sizes include:

Quart Bottles
Gallon Bottles
2.5-Gallon Bottles
30-Gallon Drum
55-Gallon Drum
275-Gallon Tote

Product Code: DEO • Brand: AMSOIL




MSDS Data Sheet

Product Details Tech Data Reviews & RatingRelated Videos

Product Applications
Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:

Product Application Specs

• API CK-4/SN, CJ-4, CI-4+, CF
• Volvo VDS4.5, VDS4, VDS3
• Mack EOS-4.5, EO-O
• Renault RLD-4, RLD-3
• Cummins CES20086, CES20081
• Caterpillar ECF-2, ECF-3, ECF-1-a
• DDC 93K218, 93K215, 93K214
• DFS 93K222
• ACEA E9, E7
• MB 228.31
• MAN 3575
• MTU Type 2.1, II, I
• JASO DH-2
• Allison TES439
• Deutz DQC III-10LA
• Scania LA-2
• Chrysler MS 10902
• Ford WSS-M2C171-F1

Product Description
Maximum Engine Protection: Wear on rings and cylinder liners leads to increased oil consumption and loss of compression, resulting in reduced horsepower and fuel economy. Independent testing shows AMSOIL Signature Series Max-Duty delivers 6X more wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222, delivering the security of providing your diesel the extra protection it deserves.

Viscosity Control
Using top-tier synthetic base oils, AMSOIL Signature Series Max-Duty is naturally resistant to oxidation and the thickening effects of soot contamination. That, along with boosted detergent/dispersant additives, keeps soot particles suspended independently, helping prevent the formation of larger, wear-causing particles. Viscosity increase is minimized and soot-related wear is controlled. Lower volatility also helps Signature Series Max-Duty retain its viscosity after high-temperature service for maximum engine protection and efficiency.

Excels in Extreme Temperatures
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil resists thermal (heat) breakdown better than conventional and competing synthetic diesel oils. Unlike conventional oils, Signature Series contains no wax, staying fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear. Signature Series 0W-40 (DZF) has a broad viscosity range that offers 4X better cold-cranking ability than a 15W-40, making it excellent for use in both hot-operating engines and cold-weather starting extremes.

diesel oil Scuffing Test

Minimizes Oil Consumption
AMSOIL Signature Series Max-Duty has a low rate of volatility (burn-off), reducing oil consumption during operation and passing less oil vapor into the combustion chamber. It provides up to 76 percent less oil consumption than required by the API CK-4 standard in the Caterpillar-1N oil consumption test.

diesel Oil Consumption

COMPATIBILITY
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil is compatible with other conventional and synthetic engine oils. Mixing AMSOIL diesel oils with other oils, however, will shorten the oil’s life expectancy and reduce the performance benefits. AMSOIL does not support extended drain intervals where oils have been mixed.

Aftermarket oil additives are not recommended for use with AMSOIL synthetic diesel oils.

diesel oil OfficialOil icon

SERVICE LIFE
Diesel Engine Service Life

Heavy-Duty On-/Off-Road: Three times (3X) OEM1 recommendation, not to exceed 60,000 miles/600 hours or one year, whichever comes first.

Turbodiesel Pickup: Two times (2X) OEM1 recommendation, not to exceed 25,000 miles or one year, whichever comes first.

Gasoline Engine Service Life

Two times (2X) OEM1 recommendation, not to exceed 15,000 miles or one year, whichever comes first.

Drain intervals may be extended further with oil analysis.

Refer to your owner’s manual for OEM drain interval recommendations and guidelines for severe and normal service.

Note: Extended drain intervals are not recommended for performance-modified engines, when using biofuels containing more than 10 percent ethanol or 15 percent biodiesel (B15) or for 2007-2009 Caterpillar* C13 and C15 on-highway engines. Extend drain intervals beyond OEM recommendations in these instances only with oil analysis. Note: 2007-2010 Dodge**, Ford** and GM** turbodiesel pickups are also not recommended for extended drain intervals when using DHD.

HEALTH & SAFETY
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).

Click here to view the MSDS Data Sheet for AMSOIL DEO.

Keep out of the reach of children. Don't pollute. Return used oil to collection centers.

TYPICAL TECHNICAL PROPERTIES
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil (DEO)
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)15.4
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)94.5
Viscosity Index (ASTM D-2270)173
CCS Viscosity @ -30°C, cP (ASTM D-5293)5555
Pour Point °C (°F) (ASTM D-97)-43 (-45)
NOACK Volatility, % weight loss (g/100g) (ASTM D5800)9.2
Total Base Number (ASTM D2896)10.1
High-Temperature/High-Shear Viscosity, cP (ASTM D5481)4.3
Sulfated Ash Content, wt. % 0.99

6x More Wear Protection than Required!

Understanding the 2017 FA4 and CK4 Diesel Oil Specifications

Diesel Power Challenge

Did this product meet your expectations?

(click on a star to rate)
Product Name: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)
Current Rating: 4.87 out of 5 stars
Total Votes: 204 vote(s)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Curtis: space

Great Diesel Oil

This oil is the finest quality I have ever run into. That is why it is in all our Diesel trucks.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Richard: space

Best oil for emission sensitive vehicles

Use on my stock 2012 duramax with over 100,000 miles. No issues with dpf or other emission systems. With oil analysis, it holds up great for around 15,000 miles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tim: space

Good oil.

Seems to be good. Use it in my new John Deere X750 garden tractor.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joseph: space

Looks like a good thing

Time will tell. Engine temperature down by 25 to 30 degrees

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dennis: space

Signature Series Max-Duty Synthetic Diesel Oil 5W-40

The Amsoil products ive purchased are all excellent quality..super fast shipping. I have been using many of your products for years. The oil also made the small engine noise the newer diesels have even quieter. Thank you Amsoil!!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

Oil for my car.

I ran this in my jeep there's a 3 L Italian motor and I have never had any problems.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Michael: space

Definitely recommend Amsoil over any other brand

I travel a lot fishing bass tournaments all over the country pulling a 21 foot bass boat and I immediately noticed a difference when I started using Amsoil in my Ram 2500 diesel. Engine runs quieter and smoother. Can't say enough good things about Amsoil products.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Matt: space

Good stuff right here

I watch my oils pretty close when buying brands. Amsoil Max Duty has the highest rating in wear tests. Seeing as how I plan to keep my truck for many years, this is my oil of choice.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jeff: space

Almost ready for my next oil change!

Wouldn't put anything else in my engine!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Nick: space

Yes

I love your product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

Yes

My truck love the extended 15w 40 I use the 20 50 in motorcycles you can feel the change right away engine just pers

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Steven: space

Number one!

Awesome product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Donald: space

Long Distance Insurance Policy

Have a 2014 Ram Ecodiesel...they have known bearing defects. Use Amsoil to reduce the likelihood I'll need a new engine.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Andres: space

Long engine life

Looking forward to 300000 miles plus on my truck

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Richard: space

Yes

Used this for years served me well ,

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Michael: space

Best product

Best diesel oil out there.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Francisco: space

I'm an AmsOil user for ever

I've been using AmsOil since the company started. I use AmsOil on all my motorized equipment. Great Product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by William: space

I will buy again

Love it

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Douglas: space

Ram Oil

Use on my 17 ram! Wouldn't use anything else !!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chuck: space

Best quality synthetic on the market

Best oil value for my Cummins.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ronald: space

Will buy again

Best diesel oil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sam: space

Best Oil and Quick Delivery

In my experience and research AMSOIL is the best. The ordering process is fantastic and I always get the product within a few days of ordering.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by John: space

Oil

I like Amsoil it is a excellent oil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Alexine: space

I would buy this product again and again

I love the product.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Don: space

Excellent diesel oil

Great tough high performance oil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Lindell: space

I would buy this product again!

I use it in my Ford F250 it seems like the mileage went up a little when changing to the synthetic Diesel Oil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Raymond: space

Couple different applications that I use this in

I have a 2006 Dixie Chopper XT 3300 with the 33 horsepower Generac engine this oil excels in high heat continues to hold its viscosity oil still very clean after 100 hours that if I wanted to I could go to 200 hours before Servicing

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jon: space

I would recommend this product.

I used this in my kubota m7040 tractor and I'm very pleased with the product. Usually after runnning regular oil in it, after just a couple of hours it will already turn black, but after running 40 hours on the AMSOIL, it is still very clean.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mac: space

Works great

Use in my Onan gas generator

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Douglas: space

Best oil ever!

Best oil I have ever used!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Michael: space

Great Oil

Great Product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tony: space

Only oil I will use in my Cummins

Awesome

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Morgan: space

Good product

It's doing what I need to so far. The trucks happy so I'm happy, I like I don't have to run any additives with it.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ronnie: space

Extremely happy with my purchase

I use this oil in my 2012 ram very satisfied with this product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Robert: space

Money saving engine oil

what I like is that I can use this oil longer than the MFG recommended intervals so in the long run I will save money and reduce oil usage

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kirk: space

I only use Amsoil

Great product. I on mi y use Amsoil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dwayne: space

I buy this product again and again

I am a long time user of many Amsoil products and am very happy with all of them. I never worry about wear in my Duramax with Amsoil Max-Duty Synthetic. I was convinced that Amsoil was a far superior lubricant after reading about Amsoil's initial development. This was high-tech before high-tech was common outside of military applications. It took real vision and perseverance to develop synthetic lubricants that are truly affordable.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by David: space

Definitely would buy again

Been using for about 14yrs in 93 Dodge Ram diesel. Still runs great. Got around 250k miles

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Adan: space

Great product

Use this on my work truck, didnt notice a huge difference in performance, it still is rough but that may be because the truck is a 7.3l diesel, which are not smooth running engines. I did notice slight increase in fuel economy. We drive the truck a lot and no issues.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Adan: space

Saves money

Use it on work equipment, used on kubota diesel zero turn mowers. No issues, low cost for extended service life, reduces downtime and saves money

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Andy: space

You made me some happy customers

It makes my customers happy and more confident thier engine will last longer

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Andy: space

Happy customers i have thank you

This is on customer vehicles and they love it

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Winfred: space

I love the 25000 mile oil change instead of every 7500

Doing good so far, just put in back in June. Seems to be doing good.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Terry: space

TBN are still strong after 10,000 miles

Great product. Still experimenting since installing my by-pass filter system. Oil looks cleaner than before.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jon: space

Always Amsoil, and only Amsoil.

My Power Stroke runs better with Amsoil - Bottom Line !

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mitchell: space

Repeat customer

Always prompt shipping. Best oil out there

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

Always use amsoil

Great stuff

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sean: space

Great product

I use this on my boat engines and truly stands up to the test!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Douglas: space

I will purchase again when needing to change oil

Really good motor oil for diesel motors, 15/40 durning summer months, 5/30 for winter weather here in Texas

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by James: space

I will always use AMSOIL oils

I call this real engine oil, I feel that while running my truck hard that AMSOIL oil protecting my engine internals better then any other engine oil out there.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sam: space

Use 15/ 40 oil

Change oil once a year or 5000 miles

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by John: space

I will buy again

Changed from a leading brand, this beats all others

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

Signature Diesel Oil

The best oil period.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ron: space

I will never use any other products in my truck

I have been using this oil in my Dodge ram p/u since I bought it in 02. It had 60 k miles on it then. Now has 350,000 miles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Virgil: space

Dodge driver

use in my Dodge Cummins turbo-hope for a lot of miles !

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kenny: space

Will buy again

Great product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Fritz: space

Good product

Engine oil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by David: space

I will continue to purchase

I have used this oil for the past 11 years and by far it is the best that I've come across

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

I recommend this product

Great prices

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

Would recommend this for all 6.7

Great products

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ryan: space

I would buy this product again

The only oil I will use. Great product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Charles: space

yes

yes

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Charles: space

yes

yes

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Charles: space

yes I will continue to buy

great oil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

I Can't Beat It.

I use this product in my 13 Frieghtliner with a DD15. 60-70000 km between oil changes. My DD15 does burn or lose any oil, as a matter of fact I don't have to add a drop. My oil pressure is higher before a service then regular brands overall. I can't rave enough about this oil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hilton: space

Brothers truck

Great oil switching my whole family over to it

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Byron: space

Will buy again.

Great oil for my power stroke.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dale: space

Great product

Great oil use it every time.looks new when I change it

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Al: space

Buy again!!!!

Customer is well pleased with the product!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Fred: space

Yes

Does a great job

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Peter: space

Measurable advantages!!!

Love Amsoil products. I run their lubricants in every oil reservoir in my truck. I don't have a temp gauge on my crankcase oil, but in my transmission, changing to Amsoil brought the temp of the oil down a measurable 10 degrees. that is significant.

I find their products well worth the money, their filters well built, and they ship promptly. It's not a hard decision to make.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Richard: space

Use nothing else

Great product great customer service

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Doug: space

Amsoil is quality Oil will buy always

I have used Amsoil in my gas vehicles and loved it this is used in my 6.0 Powerstroke will be my first time in my diesel so far it's been 3 months and truck is working great I will reorder for my next oil change and have a better feel for the product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cheryl: space

Absoultely

Great prduct

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Arturo: space

Fast shipping !

As advertised ,Great products . Fast shipping

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tom: space

Time will tell, but all other Amsoil products are great

First time switching from Shell conventional. I used Amsoil flush before hand and installed the Amsoil bypass filter. The only noticesble difference is that of lower okl pressure. I'll check the oil cleanliness in a few weeks.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by James: space

I will continue to use this oil.

The best oil in the business! Keeps my 2004 6.0 running strong. Still running original injectors, high pressure oil pump and head gaskets. I run it 10k with OEM oil filter changes every 5k. Nothing else goes in my trucks!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dan: space

Yes

A piece of mind, know I'm protected

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kelly: space

I will buy this again

Changed oil at 12000 miles with some heavy towing. Had the oil tested and the results came back excellent, going to change again ant 15000 miles and have tested to see where i go next.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joe: space

titan xd

I exclusively run this in my Titan XD I with the 5.0 Cummins. Great results so far

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jorge: space

100%

I use on a Diesel generator.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ty: space

Highly Recommended

This oil has given my 7.3 '97 power stroke new life. Easier to start on cold mornings.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Robert: space

Only oil I'll ever need !

Like I said ,when you run with the best ,you can forget about the rest AMSOIL # 1

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Steven: space

I will bye again !!

I use this product in my 2014 Dodge Ram 3500, I love the mileage between oil changes, my filter is hard to replace, I've not burned one drop of oil & my truck runs great! I have used it since my truck was brand new, with great results to date!!!!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Steven: space

I will bye this oil again!

I use this product in my 2014 Dodge Ram 3500, I love the mileage between oil changes, my filter is hard to replace, I've not burned one drop of oil & my truck runs great! I have used it since my truck was brand new, with great results to date!!!!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Justin: space

Great oil!

Oil stays clean for a long period, oil analysis tests great! By far my oil of choice!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Lance: space

Great Diesel Oil

Best diesel motor oil on the market! Have tried others and would never go back!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Donald: space

6.4 diesel

Best diesel oil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Matt: space

Absolutely would use this again!

Great oil. So much better then full synthetic and dinosaur oil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ron: space

I intend on using this again

This is the best oil I've used.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by McLovin: space

Best

The best oil i have ever used and will continue to use in every vehicle i own.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Duane: space

Big Changes

The proof is in the results. I tested the Rotella T6 from dodge and had higher than averages in Iron, copper and silicone. With the amsoil all of those are back within spec on the 1st run of amsoil. I ran the amsoil 500 miles longer than the Rotella. My second batch of amsoil is in the engine right now with 2000miles on it.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by BG: space

I will use this product again

Great Product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by NDBuffalo: space

Excellent!!!

Great service with a great product. No better way to protect my L5P !

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joe: space

Great product

Keep up the great work

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hunty: space

Goid

Good winter oil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Airman: space

Ford f-450

So far so good for the oil. The best oil on the market as I am concerned and especially for my Diesel Heavy Duty F-450. Like the other products purchased as well.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mongo: space

Only the Best for My Truck

Been using this since the original oil was changed out. When I get the chance to talk of how I feel about what is required to make a Diesel engine to be environmentally compliant, (which I'll hold my opinion). No matter how long or short a conversation is, the one question asked of me is what oil am I running? After answering Amsoil, their response is usually, I'm running the best, or if someone is another brand loyalist, their response is it's one of the leading oils out there!
After reading and watching videos on Amsoil, it was a simple choice!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by CTown: space

👍🏻👍🏻

By far the best

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Big A: space

I would highly recommend this product

I run this oil in my 2002 Dodge Cummins. I've been running amsoil for the past seven years now. My truck couldn't be happier.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by macs: space

Another great product!

On my last oil change, I switched to the 15W-40 Signature series Max-Duty synthetic Diesel oil. I had been running the 15W-40 Heavy duty Diesel and Marine oil since 2008 with excellent results, so when this one came out I figured why not give it a try. So far, the oil has performed exceedingly well. Engine runs cool, smooth and quiet. I own a 2006 Silverado 2500HD LBZ Duramax which is aproaching 400,000 miles and it's still running great. Oil change intervals have averaged between 12000 - 18000 miles for the life of the truck. I still don't even need to add any oil between changes. I run Amsoil lubricants throughout the whole truck.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by CDP: space

Good to go!

Been running this oil for 50,xxx miles + and zero issues.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Robby: space

Best oil for my application.

It is the best oil for the price.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Av: space

You can not get better oil

I have used Amsoil in all my vehicles for 25+ years now.
You simply can not get better oil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dmax: space

Diesel oil

This product is an excellent product I am very satisfied in the performance that it has given me

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by N/a: space

I would buy this again

Use amsoil in all three of my vehicles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tank: space

Gréât diesel oil

I like this oil it is great!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sparky413: space

Best diesel oil

Great oil !!!! Lower evaporation than all others I've tried

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Happy Camper: space

Have used your products for over 200000 miles in two Chevys

I have run your oil and your bypass filter system over 200,000 miles while towing a 10,000 pound travel trailer most of those miles.
I have had zero problems during that time.
I change the oil one time per year, the bypass filter one time per year, and the full flow filter two times per year, while putting about 20,000 to 25,000 miles on the truck. This takes all the hassle out of oil changing, and no problems. I had the oil analyzed for 5 years, and never received a result that indicated the oil needed changing at the end of the year.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by The big Beano: space

Best oil I have found will definitely keep using it.

I change my oil every 8 to 10 thousand miles with a 2 quart micron bypass filter. I added myself very easy with kit 215000 miles and never lost a fuel injector, of course bullet-proofed it no problems love it

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Scout: space

superior oil, not for cummins

this is a superior oil to other diesel oils but at least on a 5.9l cummins the oil gets way to thick from the soot at around 5000 miles, I would not recommend going past that interval, I am using the amsoil filter as well.
My 7.3 power stroke takes 15W40 and goes 20k miles before getting that bad.

This oil doesn't stand up to the amount of soot produced in 5.9 cummins in my experience which is why I give it 4 stars

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rowdy: space

I USE AMSOIL IN ALL MY VEHICLES.!

Great product.! Amsoil saves me money.!
I get many miles before oil changes. This product will extend the life of my vehicles.!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tom: space

all i use in my truck

smooth running .

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bob: space

Excellent product

I rely on the product being able to go the distance or time frame without worrying about going a little longer because of not having the time to change it . I have total trust in the product. I have had better mileage results with this oil also.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by DK: space

Repeat Buyer

I have used AMSOIL products for 30 plus years. That should say how I like their products

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by AHA: space

Very Happy with Product

Love the product. No complaints

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mad Dog: space

Security

The knowledge that you've used the best product for the job equals many happy, trouble free miles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mister Cedric: space

Using Amsoil since 1983

Very pleased with the Amsoil product line. Great performance and this oil is quite honestly the best for my diesel equipment

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by None: space

May buy again

Good oil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Diesel Power: space

Amsoil...Great Diesel Oil!

I use Amsoil in all my equipment (several are diesel powered), I'm very happy with their product and I've used it for years.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Greg in Oswego: space

This is the only oil for my truck

I use this because it is the best that's available. I little more money for peace of mind. In the future I also plan on adding secondary filter and relocation kit.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Roger: space

Great

I have used this in my 07 GMC Sierra , I bought the truck with 8000 Miles on it. I have 240000 now,. 6.6 turbo diesel. I changed the oil every 12 -15 thousand miles , I'm a quart low at 12 thousand miles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Diesel Lover: space

Amsoil - 5 Star All The Way

If you have a powerstroke diesel (any year) you need to run Amsoil oil along with the oil bypass system. My results from Blackstone Labs have been outstanding. We pull a 5th wheel camper and because of the heavy work that the truck does - we change our oil every 7,500 miles / 200 hours.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by D man: space

Yes

Great

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Db: space

Live This Product

Noticeable difference in cranking during cold weather. Oil pressure never changes a bit when running this product.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Angus: space

This is the only oil I will use in my 2017 F250 6.7 period.

You notice right away after you use this oil in your diesel engine. Sounds quieter and runs smoother. I combine this oil with the amsoil oil bypass filter and Dans from amsoil install kit. I take oil samples and send to amsoil agent. Oil has maintained its initial install standards. Unbelievable.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JacksonRabbit: space

To Early To Tell

I am using this oil in a low mile Chevy Silverado HD with diesel engine. I haven't had any issues, but with the low mileage, its too early to give a more detailed review.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JB: space

Great product.

Use it in my truck.
I've always used Amsoil products and have always found them to be high quality.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark M: space

Works great in my F350

I use AMSOIL in all my vehicles and they operate great.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joe: space

Best oil for my Chevy LMM

Eliminates the typewriter noise that most owners of the Lmm Duramax hear. Been using Amsoil products for years in all of my engines from motorcycles to mowers.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by bikeman41: space

I use this oil all the time1

Once a year oil change!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dirty dave: space

Only product I use for years

Great product , does more than what it says. All fluids in trucks and dirt , street bike .

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hand Cannon: space

The best I can care for my truck

Amsoil is legendary synthetic oil. I purchased the Amsoil dual bypass oil filter and wanted to compliment the protection for my vehicle by adding the best synthetic oil available. After doing my research, I feel as though I am providing the ultimate protection for my truck. I am no mechanic, however, truck runs excellent and I am pleased with my purchase. Extended mileage oil change is a big plus.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Drivr51: space

Love this product

I use this product in my 2014 Silverado 2500 duramax diesel. The intervals between oil changes are phenomenal. All amsoil product lines are worth the money including this max duty diesel oil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JG: space

Love this oil!

Great oil! All of my UTVs, farm equipment, and trucks are diesel. When in the northern sections of the country and extremely cold, there is a noticeable ease with startup vs conventional oils. I'll never go back.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Audie Baca: space

Diesel oil

Great product! Been using the diesel oil since my truck was new. Truck now has 155,000 miles and hasn't skipped a beat!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rocketman: space

All of my vehicles run only on Amsoil lubricants.

I have all confindence in Amsoil products and will use them always.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sixpack: space

The only oil

Covers my 6.7 in cold conditions

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Pj: space

I will buy only this oil for my personal trucks

This is an outstanding product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Seabass: space

Only amsoil

I swear by amsoil for anything i own and always will

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

Diesel oil

I use this product in a 2012 Ram with a 6.7 Cummins motor. The oil does get very dark between changes.
Have not had any issues, and motor oils do get strained with diesels.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chumleyy: space

Highly recommend this product!

Truck really loves this oil, since I've made the switch!!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rusty: space

Use this oil in all my diesel trucks.

Never had a engine go down using Amsoil. Put a ton of miles on my diesel engines as well as hour's. All is good.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cecil: space

I would buy this again and again

This is the only oil I will ever use.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Brad: space

Engine clean?

I have a 2007 GMC Diesel with the LMM engine and over 300,000km's. I did the first oil change and i was surprised that the particulate sensor said it was due for another change within 5000km's. I figured it was cleaning out the carbon and residue from the old oil change and changed it again. This time it went longer but still less than it should. The third change we went on a family vacation which involved towing our trailer over 6000km's. Came back and still had over 30% left. I suspect inwas right and this oil was cleaning out the deposits and gunk from my old oil. Moral of the story, if it seems to be getting dirty faster it probably is, but once it is cleans out the old seems to last longer and work better. I'll let you know in another 100,000km's or so.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Andy: space

This is the best oil I have used

I use this oil in my ecodiesel, I just recently did an oil analysis and it came back perfect. I will continue to use this great product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

Good stuff

Truck runs quieter. Especially in cold weather.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave: space

Signature series maxi 15/40

I change my oil once a year his oil allows me up to 25,000 miles before I have to change.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tak: space

The good oil

I run Ams oil in my truck, SUV and motor cycle .It costs a little more but to me it's worth the extra cost.. I tend to push my oil changes a little longer so I just use what I think is the best.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dieseldog: space

The best!

I will always use Amsoil in any vehicle that's worth anything to me!
Currently driving a Cummins and the difference is extremely noticeable!!!
Power increase, less noise, just about eliminated my oil loss and seems to have even improved my fuel economy. It's like liquid gold for my engine!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bobby: space

Best oil in my F250

I purchased the signature series diesel oil and filter and after 6,000 miles, I decided to send my sample to a third party for testing. The report came back stating my oil and engine health was one of the best they've seen for an engine with over 200,000 miles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Will: space

I would buy this product again and again

I use this product in my pick up that has a Duramax and it with 187,000 miles

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Brian: space

Yes

Amsoil is a very good oil for my echo diesel dodge truck. I have used Ams for years and I am sold on the product.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Yelly: space

Amsoil producis

We have used amsoil on our farm and if it holds up there it can hold up to any thing! I won't use any thing but amsoil products in every thing I own!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by red: space

i would buy again probably soon also

great product

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dan: space

Use it in everything

I have nine diesels on the ranch and use Max-Duty in all of them including a few gasoline engines. Works like I expect it to work.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rick: space

Great product

Use this in my 12v Cummins was adding about a half a quart of oil every 1000 miles before switching to to this oil now it's about a half a quart every 4000 miles and I change it every 5k.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dirtman: space

The best oil there is

if you want the best protection for your engine buy amsoil. I use it in everything so my equipment will last.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Friedrich: space

I use this for my oil only

Hands down the best oil out there i have tested my oil after it comes out and still have amazing tbn numbers in ty he 5 range with 7000 miles on that oil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Andy: space

Excellent Product

Switched my 2015 powerstroke over to this when it hit 20k miles. Now at 135k and zero problems. When it says "change oil soon" I go online and order it, 2-3 days later it is here. Wish there was a better price break on the gallon jugs rather than having to pour in 13 individual quarts as it is cheaper by the case.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by John: space

Nothing else goes in my truck

When I ordered my duramax in 08 I wanted to run the best oil and fluids because I don't plan on buying another 65,000 truck. I researched extensively and found the decision easy. Everything but the radiator has amsol. I'm at 320,000 problem free miles. With the exception of the headlights that regularly burn out, I haven't had one single issue with my truck. I bought a 24' triton boat with a 300 yamaha and the day my warranty ran out it also got refilled with amsol marine oil. .

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by navret02: space

Best Oil Ever

Was introduced to this oil and it really works. Protecting my 6.0 Diesel Engine under any load, especially with the Bypass oil system!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bob: space

Switching oil

The total Base number is way too low for my liking since they changed the formulation. I am switching brands of oil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gene: space

I Would buy this product again.

I like the way it keeps my engine clean and running free.

Item Reviewed: Premium Diesel Oils (DEO,DME)

Reviewed by charlie: space

6.6 duramax diesel 2006

well this is the best oil ive ever used on my diesels lol I tried out the amsoil in a way that most peoples wont ever or even try to see how long it actually lasts before it completely breaks down ,, soo what I did was I just kept changing the oil filter every 12 thousand miles until it finally broke completey down lol I made 43,768 miles and that where it actually just burned out but all and all its the best in the world !!!!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)
Discussion Url

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Carlos: space

I will continue using this product.

I have been using Amsoil since 2009.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Pete: space

AMSOIL

I have tried every kind of synthetic for a diesel engine and found AMSOIL to be the best by far. I have a E350 Ford van with a 7.3 power stroke engine. I have gained two miles per gallon and the motor runs smooth.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kevin: space

my Cummins is loving it's new life blood

First 10K was great, pushing this last oil change to 25K will update review after my oil analysis is done.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Don M: space

Great Products

Primary use is for my Cummins 6.7 in my 2014 Dodge Ram. We use the truck for towing and I feel that Amsoil Signature series helps protect my truck in severe duty towing.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Austin the concrete pumper: space

Makes my engines happy, and me happier

Well, the reality is... Diesel maintenance is expensive, no two ways about it.

With this oil I can run longer intervals with less deterioration and degradation, even on the heui engines I own and maintain (which works oil to the max)

I have to say, with the oil analysis that I get back consistently telling me that my engines are happy to run extended change intervals ((while still changing filters at normal intervals)) I'm a happy camper, over the next ten years I'll save tons of money.. tell me that wouldnt make you happy.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Casey: space

Best Diesel Oil!

I use this product in my Ford F250 6.0L PSD. I noticed my turbo spooling up easier and quicker after switching from conventional oil. The 6.0L PSD's are very tough on the oil due to the high shearing of the oil pressure run fuel system and the lubrication of a hot turbo. Many professionals highly recommend changing at 6000 miles in the 6.0 PSD. I run my diesel kind of hard with pulling a lot of heavy loads and running a hot tune for daily driving and playing around, my last oil change was at 9000 miles. Oil was still full without adding any, still feels more slippery than new conventional. I reuse it in old oil burning engines and it cuts the oil consumption in half. A relative of mine has been using my drained Amsoil in their beater car for over a year and it cut way down on the oil consumption. I would run the oil longer in my 6.0, but like to recycle it into the older engines. I use only the Amsoil long life oil filter. I may purchase the oil test kit in the future just to see if there is any depletion in the strength of the oil, but I am very happy with my use of this product.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ryan: space

I'm hooked! Easy though as it's a quality product!!

So glad I've switched to Amsoil products! I want nothing but the best going in to my engines. Outlasts any lubricant I've ever used in my vehicles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by AA RON: space

GREAT PRODUCT

Amsoil synthetic keeps my work truck running and me making money. The only way to go.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by MR G: space

Great product

My cummins runs so much smoother

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by None: space

I would buy this oil exclusively

Best oil made

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Robin: space

Yes

I trust this product compact to what we getting out there it is proven to have the correct antiwear detergents blend into the oil and you can listen to the effectiveness and quieter motor when idle and driving at your cruse speed

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by SD: space

Great oil

I use this on my 2018, Super Duty 250

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hawk: space

Awesome product!

The best oil product I've ever used.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by STW: space

GOOD STUFF

GOOD STUFF

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Matt the Hunter: space

I will keep using this product

I use this in my Daily Diesel Truck,I love the power it frees up.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bigb: space

#1

200k on my cummins diesel with amsoil.still like new.great stuff.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jr: space

Great oil

Use this oil on 17 duramax works great glad i can get quality oil shipped to my door gives me peace of mind my truck has the protection it needs to do its job

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ink: space

I use this product in five vehicles

Upon purchase of a new Toyota the service rep recommended Amsoil. I use Amsoil in a 2014 Tundra, a John Deere 748 Diesel, a 2017 Camry, a 2014 Outback, a 2016 Highlander, and a Honda lawnmower. Well satisfied at this time.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by J-Rod: space

The best

This diesel oil is the best stuff out there! I use everything AMSOIL!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by MB: space

great product @ great price

Amsoil products fit the bill for almost any application @ a affordable price.
There products are vastly superior to most on shelf products, They even make
specific products for specific needs. all this with great tech support and easy online
purchasing. I will continue using Amsoil products for these reasons.
Thank you Amsoil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Eddie: space

Great product

Great stuff. I've been running this stuff for years. About 15,000 miles per change. I know several people that have ran it the full 25,000 miles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Perez: space

First time user

I have an 05 6.6 duramax and like that this oil gives me more miles between oil changes.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gus: space

Good oil

So far so good, like to put 15w 40 synthetic on my Cummins. Lets see next oil analisis how's holding up.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

Great products

I've been using Amsoil in my 04 Ram 5.9 L Cummins almost since it was new. 280,000 miles and no engine problems at all!
Love it!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jarvis: space

Great product

Solid premium product. I try to take care of my vehicles the same way I do my body. I look for the full protection of the lubrication this product provides in the rigorous operations I put my truck through, and the many miles I do. I'm happy with it.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Steve the boss: space

Yep. Have always used Amsoil. It's the best

Have used the diesel oil in my Ram from Day one. I believe it's the best on the market. I trust it.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chad: space

Good stuff

Changed all the fluids in my 99 Superduty(220000 miles) over to Amsoil products. Truck starts easier in cold weather trans temps have dropped 10-15 degrees towing and I gained 2 MPG.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Wild Bill: space

Will be buying this product again

Used in my 2014 Ram 1500 Eco Diesel

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Pdnh: space

Great

Was using Mobil Delvac 1. Would change oil at 15000 miles, changing the filter at 7500. Doing oil analysis at 15000 miles the oil was at 70%. Switching to Amsoil I change at 25000 changing the filter at 12500 the oil is just a little over 80%. Results speak for themselves.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Justo: space

I would buy this product again again

I am using the amsoil for the last five years
About 100,000 and 120,000 miles per years
My semi truck and me we are happy and saving money it's amazing for the best

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jemeda11: space

I would buy this again and again

In my diesel trucks. Awesome oil. Lasts 25000km before I even think of changing it.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Vegadriver: space

Great oil

Run this oil in my 2012 Duramax. Can go a full year without oil change. Saves me money. Also use the Amsoil filter.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JasonV: space

EcoDiesel oil for my truck

Love it.
Good quality oil for a good price for this quality oil.
Will Definitely buy again as its cheaper to do it my self than having the dealer do it and I get a way better oil for my truck.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by NYMustang50: space

Great Product

Stuff is worth every penny. Oil analysis test prove it. Always use Amsoil in all my personal engines.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by PAPPY: space

BEEN USING IN MY 2007 GMC

ALSO IN MY SS2 CAMARO

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by DWS: space

All I use

Been using Amsoil diesel oil and Ea08 filters every 15k since the truck turned 30k miles. Have 276k now.
Could do a longer interval with testing

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ron: space

Max Duty 15w-40 Diesel Oil = Good Stuff

I am relatively new to Amsoil but have and have both Duramax and Cummins - currently have a L5P Duramax with an Amsoil Duel Bypass oil filter set up which I did not have on my previous Duramax. Thus, apples to apples may not be in the following:

1. Blackstone reports come back much better than with the Rotella T-6 I was using in the prior '15 Duramax actually with about 7500 vs 5000 miles.
I got some usage w/Rotella T6.

2. A bit of oil usage with the Rotella t-6 but absolutely none with the Amsoil.

Repeat not apples to apples exactly as different engines and the L%P has a duel bypass set up on it.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by BRIANS cummins: space

AMZING STUFF 429,000 miles

I use the 5w40 and 15w40 in my 2003 Dodge Ram 2500 5.9 cummins ... when I got the truck it had 378,000 also had little blow-by.. it ran mobile 1 most of its life .. switched to AMSOIL signature series (max-duty) and the blow-by was gone and it also slowed down completely with drinking some oil .. 7-10,000 and I might need to add 1/2 qt this stuff is AWESOME .. now I have 429,000 and this cummins runs like its NEW with 10,000 miles on it .. everyone that I know with a cummins , I get them hocked on it also .. everything I own has AMSOIL

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

I've used Amsoil for over 20 yrs.

I've used Amsoil in my last 5 class 8 trucks. Absolutely no problems. Why on Earth change. Use Sig. 5w-30 in my Ecoboost too

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Reg Moody: space

I use Amsoil exclusively

Used in all my vehicles for years

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

Diy

Maintenance

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dogman: space

I have used Amsoil products for years and will continue to.

I use this oil in my '02 2500 Ram Diesel to protect that engine for the long haul. The 5.9L Cummins is the last of the "loud ones" for Dodge. I want to try for 750,000 to 1 million miles before it needs any real work put into it. That sound is one of the reasons that I bought it in the first placeI love how it runs and I get great longevity out of the oil. If you run a diesel you would be crazy to not try some in yours. Worth every penny!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by rdj519: space

2010 gmc Diesel truck

I installed the bypass oil filter system when I bought it new. Oil sample every 7000 miles. This oil and system is the best thing I have ever done for my big truck. Only the best for my baby

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jack: space

Too Early to Tell

I have always run synthetic oil in everything, but since I bought my Duramax, I thought I'd try you product and filter. So far so good, I'll let you know in about 150000 miles.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by obg: space

oil

Great stuff wouldn't use anything else.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by REJ: space

I will buy this product again

This is the only product that I can find that is recommended for my Eco Diesel and it performs as advertised.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike, 2017 Dodge Ecodiesel: space

Solid Amsoil User

First time have used Amsoil diesel oil. So far so good. However I didn't notice much change in fuel economy after using Amsoil 5W40 SS diesel oil for my first oil change in this truck, in town driving. High way driving did show some improvement, all the way up to 30.2 mpg, previously had gotten 29 mpg. I think part of this is my motor is still breaking in as diesels take awhile to do so. Overall I am pleased & have used Amsoil in both of our vehicles going on 18 years.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Pinkpeaches10: space

I would always buy amsoil

Perfect oil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Doc Pat: space

I always use this product on my diesel trucks.

I use this on my 3 diesel trucks. 1985, 1994 and 2001 F 350.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JGD: space

Outstanding product!!

I am using this in my new F250 Diesel, as always Amsoil has created a superior product you can depend on. I can physically tell a difference just by using this oil. The truck runs so much better.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jonathan: space

Awesome stuff

I am rough on my trucks farm use hauling ext... Has 300k+ doesn't lose it burn a drop still run 25k between oil changes love my amsoil

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Russell: space

The only oil

I was told it was it would help eliminate dust particles from the DEF system that build-up in an engine. It has helped with eliminate dust buildup in the engine significantly. Immediately after using the first time, many miles ago, I felt more power being produced from my engine. I'm a very satisfied customer.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Butch: space

I use Amsoil in all my vehicles.

I have used Amsoil for 20 years. I like the extended oil change intervals, it saves me money and doesn't damage my equipment. I took oil samples and had them tested after 18,000 miles. They came back no wear and more mileage before changing. This was on a 1978 Dodge van with 180,000 miles. I currently use Amsoil in my 2006 Ford F350 6.0 diesel FX4 in all gear boxes, and 2012 Ford fusion. I am very satisfied with Amsoil performance.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Joe: space

Have used Amsoil for 20 years.

I use Amsoil in every combustion engine that I own. Vehicle, farm equipment, lawn mowers welding machine and generator. Never had a lubrication issue with any of them.
Best oil on the market hands down!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Scott: space

Synthetics

I believe in synthetics and Amsoil.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Doug: space

I will keep buying this product

love this product, but have nothing to compare it to because the last two new trucks I've purchased i change the motor oil and transmission fluid as soon as i get home. sold my 2007 GMC Classic Duramax 4X4 with 180,000 miles for over book price. To a mechanic. i could go farther but always change oil at 5,000

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jason: space

I will purchase this again and again.

I use this product in a 3/4 ton work truck.
Very high quality product.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Grandpy: space

Great

No worries

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Super04FX4: space

Best Diesel oil on the market

After trying several different synthetic diesel oils over the years...I have settle on AMSOIL as the best. I see consistently better cold starts and the extended change interval is a huge plus!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ray: space

I use Amsoil prod in all my vehicles.

I have used Amsoil 5w- 40 since I purchased my truck 8 years and 210,000 miles ago. The truck runs as good today as it did then.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by GregM784: space

Amsoil & Cummins

Runs great, runs cooler, a product you can trust.

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tom: space

Over 25 yrs using AMSOIL...

I'm sold! I've used Amsoil products in all my vehicles for over 25 years. Engines run more quiet/smooth, better fuel mileage, and longer engine life. I recently convinced a friend to try Amsoil, they had an immediate 4-5 mph increase! What more can i say?!!

Item Reviewed: Premium Diesel Oils (DEO,DME)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mud Creek Ranch: space

I do buy this product again and again

Love this product, use it in both of my diesel vehicles religiously! Use it in my MF 300 Dozer as well, use Amsoil in my gas engines as well on the ranch.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by G513: space

Pricey

Really haven't noticed any real benefit over cheaper options. The cost is a major problem.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by James: space

Amazing product

This amsoil does wonder's with my 2010 6.4 F250

Didn't change my oil tell 14k miles had an oil analyze at black labs came back great they said it looked better them most 6.4 diesel at 5k miles and told me they couldn't wait tell another 14k miles to see what it looks like

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Matt Z.: space

Always improving fuel economy

I have been using Amsoil in this truck since I purchased it, it turned 210,000 miles. I have averaged 17.9 mpg over the life of the truck. It has regularly towed 17k plus. These fluids are spot on!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Gregory: space

Great

I switched to this oil from 5w/30 Series 3000
Because of price.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by 7Trumpets 42: space

Fabulous lubrication

I am having regular oil analysis with each 10K mile change. Engine metals are lower than average for the V-M 3. 0. I couldn't be happier with this signature Amsoil product!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hauss: space

Top Performer

I've been using Amsoil lubricants for decades. I'm loyal to the brand. I've been with Amsoil through the good times, and one of their bad times (back in the eighties). I've run Amsoil in motorcycles, cars, trucks, boats, high-performance engines, and factory daily drivers. I have extensive experience in engine machining/building, and I've seen, first hand, how Amsoil provides performance and durability to engines that push their design limits.

Recently I bought a 2017 F250 with the PowerStroke diesel, and I got to reading about the particulate filters, and how oils not approved by Ford could cause premature clogging of the DPF, and possibly void the manufacturers warranty. Oils manufactured to the CK-4 spec initially resulted in premature wear in 2017 PowerStroke engines, so Ford released their own specification, WSS-M2C171-F1, and instructed owners to run CJ-4 oils until approved CK-4's were available. Since then several products have been approved by Ford for use in PowerStrokes, but concerned about the performance of the available CK-4 oils, and curious about how Amsoil's Signature Series Max-Duty Diesel Engine Oil compared to them, I submitted a couple of samples to the guy who runs the 540 RAT Blog for testing. The Amsoil product tested superior to all others tested to date, beat only by another of Amsoil's own CI-4 spec diesel engine oil. I wasn't surprised by that, based on my experience, but I was surprised to see a conventional CK-4 oil approved by Ford that also meets WSS-M2C171-F1, performed as well as Amsoil's Sig Series Max-Duty, and costs about half what Amsoil's product does. I would love for Amsoil to explain why their product is still superior to that competing product, even though they performed so similarly in 540 Rat's test. At thirteen quarts, half the price is quite a savings. Is it really worth the price?

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rock: space

I am going to continue to buy this product

This product is great. I have ran this product the last 15,000 miles. My trucks starts smooth after sitting for a week in the cold weather of northern NM. Never misses a beat either. Would recommend to any diesel owner out there.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by RAV: space

Consistently Reliable

Since 2010 I've been using Amsoil fluids and filters in my Dodge Ram 2500 Cummins Diesel and as a result, have had no engine or transmission failures.

The diesel engine oil & filter are both 25,000 mile change frequency; Amsoil does cost more, but you'll save money in the long run with zero failures and extended periods between scheduled maintenance.

I also ran Amsoil transmission fluid in the same truck for 70,000+ miles with no slippage, and always witness iyuyreliable, positively locked shifts.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bam Bam: space

I will buy again and always looking for better with Amsoil

I drive 114 miles a day for work

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Bentley: space

I would buy again

Feels like my trtuck runs a lot smoother

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Pete: space

I will be purchasing again

Love using the best protection available for my Chevy 6.6 that I work hard everyday and with 123,000 not a single hiccup.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chuck: space

I buy it all the time

I would and do buy it all the time

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chuck: space

I would and do buy it all the rime

😉

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave: space

Great product

Engine ran cooler in summer by five degrees with Amsoil. -25C starts not an issue, even when I forgot to plug in.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Sky Pilot: space

Amsoil - Awesome oil products

I use the Signature Series Max-Duty Synthetic Diesel Oil 5W-40 in my 2004 Dodge Ram 2500 4x4. I following the recommended drain interval so I end up changing it out yearly before I reach the kilometer limit. I do mostly highway driving. I don't think I've ever had to top it up between changes either. Great cold weather starting properties for winters in Alberta.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Stan H.: space

I am a true believer

I have used amsoil for years in my 6.7 cummins diesel and it has never failed to deliver . I recently swithed to the new 6x signature 5W-40 and I noticed that my oil pressure went up one pound and my fuel mileage went up one mile per hour also . Now to some this may not be a big deal but it adds up over time and that it is giving me better pressure at the same time only goes toward helping to further protect my engine. with the increased wear protection quality and potential I look forward to many more years of faithful performance from amsoil oil just like this .

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Greg: space

Great oil for cold winter

I have used this oil in my Silverado Duramax in cold weather and it helps with cold starts and driveability during long warm-up time. The engine gets lubrication almost immediately upon startup and sounds like it is running on a summer day. Amsoil is the best!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Josh: space

Have purchased 5 years in a row

This is a high mileage truck 350,000 km it starts great in cold weather and a faster clean start

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Phil: space

Best Oil

I have used and only used Amsoil in my 2004 Dodge 2500 with the 5.9 HO Cummins. The wear protection and the oil life is amazing.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Airstreamer Joe: space

Gives you freedom to roam!

I have been using AMSOIL in my GM tow trucks sense 2000. I have out over 300,000 miles on 3 GM pickup trucks, while towing my 34' Airstream in all the lower 48 states, 2 summers in Alaska, and all but one Canadian Provence's.
I put a dual filter kit on my 2000 GMC 2500 gas truck, and switched to AMSOIL when it had 3000 miles on it. I set up an oil diagnosis program at a 3rd party lab. I setup a system of monitoring my oil every 3 months, but only changing it one time per year (usually about 20,000 miles mostly towing the 10,000 pound Airstream). I would change the full flow filter 2 times per year, and the bypass filter one time per year. I bib not get a recommendation to change the oil from the lab in 3 years. I had no problems with the engine in the 125,000 miles I put on it.
I traded the truck for a 2004 GMC 2500 diesel truck, and went through the same setup of the oil change system using AMSOIL Diesel oil. I put 122,000 miles on that truck, with no oil related problems. I sold the truck to a friend and bought a 2015 Chevy 3500 diesel truck, and you guessed it, it has the same oil system setup on it. It now has 30,000 miles with no problems to date. The 2004 truck I sold to my friend is still using AMSOIL, and changing it one time per year. It is still being used to tow a travel trailer, but I do not know how many miles it has on it now.
I would recommend AMSOIL and their Dual Filter System to anyone that puts tough miles on their truck every year.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

this oil is really good

When I start my engine at -35 degres celcius it runs smoothly.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

this oil is really good

When I start my engine at -35 degres celcius it runs smoothly.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

I highly recommend this oil for extending your engine life

I switched my 2016 Ford 6.7 diesel oil @ 60K miles...with 126K on it now and driving 100K per year towing heavy loads"half the miles". I trust this engine oil above all others and expect to get at least 500K on the engine before I buy another one!!!!!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jamie: space

I will buy this again

This oil flows pretty good when the temperature gets down to zero.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Wild Bill: space

Just hit the 40K mark in a 2016 EcoDiesel. Only run the best

Just hit the 40K mark in a 2016 EcoDiesel. Only run the best oil and no worrys. Have used AmsOil in all my vehicles, boats, and ATVs for over 10 tens with NO engine problems.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Doubleplay7: space

I would buy this product again

This product is a good product that is good for a wide range of diesels. I run this in a 02 Ford F-250 and will be running it in a new Ram 2500.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Amsoil Believer: space

Only Amsoil Will Do

Simply put, Amsoil is the only product I will use on all my vehicles, if I can help it. Have been using Amsoil since my first FORD SVT LIGHTNING in 1993. I am using the diesel oils for my foreign vehicle, a Ford Everest, that's made in Asia. I have also used the diesel oil in my farm vehicles, a Dodge Ram 3500, and other diesel engines. You can't go wrong with AMSOIL.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Z: space

I will buy this oil again

Use in my tuned 2006 2500 Dodge Ram Laramie Mega Cab. Many miles and still runs like champ!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Eric: space

Oil works as advertised

I have been using Amsoil for a very long time. I love when they come out with enhancements like this new diesel oil. I will take all the protection I can't get.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Al: space

I will be buying this again for my grandson

My grandson uses this this in his dodge guide truck, he is a fishing and hunting guide in the Lake of the Woods Nestor Falls, Ontario area. He also use AMSOIL in his guide boat and I use AMSOIL in all of my vehicles including boats. I have been using AMSOIL products since about 1983 and as far as I am concerned there is nothing better. I recently changed my 2012 corvette from Mobil 1 to AMSOIL signature 0W-30.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Slick Nick: space

Great product

I'm using it for year in my semi and never left me down. Great quality lubricants.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ode: space

It's good stuff

I use this in my ram 1500 ecodiesel. It performs well. No usage with 49k miles.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Moparguy: space

Awesome

Awesome product. Long time amsoil user. The products just get better!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Greg: space

Great Products

The ONLY I will put in my '16 Ram 3500 Dorsal!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by $ilver6_7_cummins: space

Highly recommend

I started using Amsoil about a year and a half ago. It is now all I run. Wether it be in my diesel truck, snow mobile or boat, Amsoil has the product for it!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kissoondath Rovin: space

Ase Master tech, L1

Arms oil products is great, the experience I had with the signature series oil I have used it on 2 of my 2016 &2017 , 6.7 diesel and they both have burnt the oil , I had to add oil A quart after driving 16000 miles , now I do all my oil change at 15000 miles to be on the safe side , the arms oil is a much durable oil compared to other oil it there I will continue using the heavy duty for marine diesel and gasoline oil

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Steve: space

This is the best diesel oil out there.

Excellent at every point.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by The real noble: space

Great product

Use Amsoil synthetics with bypass filtration in my 2012 Ram 3500 Cummims. Oil analysis has got me over 20,000 kms between oil changes. Highly recommended

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ray: space

I've always used Amsoil products in my 2007 Dodge

Always change my oil every 6 months. I have only 65K and mainly tow a 30 foot trailer in the summer months. I use Amsoil, engine oil, transmission fluid, differential oil, and filters. Great products.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ron: space

Great product!

I've been using Amsoil for 15 years now. Diesels, and family's automobiles, utvs, boats, and more. I know i can trust Amsoil, and have extended the life of all my equipment. Great oil, filters, and much more.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Fordfan: space

Will use again and again

excellent

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cooory Ed: space

Amsoil 5w 50

Great oil
I run amsoil in everything

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Muleboy: space

Moving all my vehicles over to 100% synthetic

Swapped my Duramax diesel over to this oil. I want this vehicle to last for years so I am going to use the best oil I can. I plan on doing oil analysis as well to get the most out of this product.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kyle: space

I only run this oil in my diesels

I have four dodge diesels and a cat powered welding machine and I run this oil year round with zero issues. I do oil changes every 25000kms.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Pat: space

I would buy this product again and again!

I use this oil in my 2014 Dodge Ram EcoDiesel. Amsoil updated the oil from 5W-40 to 10W-40 based on Dodge recommendations. Great oil.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jon Driver: space

Like 6x protection

Under heavy usage and need peace of mind

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Chris: space

Must be good

My engine is still running and since I can't see inside it, it must be working.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by SG: space

Noticeable difference

Dumped class 3 synthetic rosella t6 for a true synthetic class 4 PAO Amsoil Sig Series 5w-40. Turbo Diesel is running smoother, quieter, cooler and 2-3 mpg boost! Worth the money!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rick Wysynski: space

So far so good

I was a Royal Purple junkie since it was the only synthetic available to me where I live and got it free. It worked great in my gas truck and other gas vehicles. I switched to Amsoil since I purchased a diesel truck and became a Preferred Customer. Really like that part !!!
The truck runs much better and accelerates better than the Ford oils that were in it and oil change at 25,000 miles is a nice $$ saving feature. I will switch to the new synthetic 5-40 on the next oil change and then extended changes past 25,000 would be nice. I monitor all things done to my truck and log it.
Put 9,000 mikes on the truck in less than 4 months and excellent results !!!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Phil in Tulsa: space

Signature Series Max-Duty Synthetic Diesel Oil 5W-40

I've been using AMSOIL heavy duty diesel oil for years and it has performed extremely well. This year I decided to try the Signature Series Max-Duty and was I amazed. I didn't believe I could tell the difference but the engine runs even smoother. I tow trailers with my truck and protecting the engine is paramount to reduce wear and lengthen the life and this oil delivers.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kelley: space

Only oil I buy

I use this oil in my skid loaders as well as heavy duty pickups pulling heavy loads daily.
I have been sold for many years after I had 6.0 diesel that dumped all the oil and the only thing that saved the motor was this product.
All the shop had to replace was head gaskets

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by patrick: space

I would buy it again and use it for all my power equipment

In my Excursion Diesel 250,000 miles

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by F450: space

Not sure for the Fords...

First, I'll say that I love Amsoil. I run Amsoil in every engine/transmission/differential/etc I own. I'm not sure about this new oil. My oil temp in a Ford 6.7 Powerstroke usually runs about 203 degrees (previous version of Amsoil diesel oil). With this new oil (December it might have come out???) I'm running 7-10 degrees hotter on average. I'll probably try one more oil change with it and if it still runs hotter, I'll have to find another brand.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dave: space

Extended oil life, runs cooler

I am astonished at the engine oil life provided by this oil, compared to the Mobil synthetic I used previously. I'm at 14000 km, 80% city, and the computer is telling me I still have 20% oil life. Previously I would get to about 10k and be looking to change. Admittedly I changed to Wix filter at the same time from Oem, so not a 100 % true comparison. Winter, with more idling, will be the real test. Engine seems to be running cooler even in 30C weather- that's hot for us!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Nimble: space

Great oil

Use it a 09 Chevy Duramax, starts great even if it hits 0 or below

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by John R: space

I would definitely buy this product again

I currently use this product on my 2016 Ram EcoDiesel with no issues and have use the previous 5W40 diesel product on previous diesel pick up trucks and heavy-duty equipment with no complaints. Thank you Amsoil.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Matt: space

Great product only oil for my Harley, period!

Engine ,primary and transmission fluid for my fxstdi.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by jobu: space

impressed

i have used Amsoil in the past in a 6.0 powerstroke and didn't really see much difference, tried it again in my 6.7 powerstroke and love it. The motor starts and runs smoother and helped with the mpg

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ryan: space

Great stuff

My son uses Amsoil in his 2011 Ford F350. He has many mods on his truck. This is the only oil that he trust.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rob: space

Did what I was hoping it would do

I put this in my Kabota BX25
I was hoping it would quiet the motor and make for easy starting on cold inter days.
It did quite the motor a lot.
Started with no issues.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Big Frank: space

Great oil unbeatable

New 2017 ford diesel. Outstanding oil. Highly recommend it. Would only use this oil in my new Diesel engine It is so high tech

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by None: space

Great product

Ran for 8 thousand miles & love it so far

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dimonic: space

Correct oil and filter, ready and waiting for pickup.

I like to do my own oil changes, and avoid all the "additional" services the dealer offers.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Cumminswitit: space

Love this stuff

My truck and I love this stuff. I run it for a year between changes and love it. Best oil out there

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by elkoholic: space

Will use this oil from now on.

Truck is used for hauling horses.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Petro: space

Trusting Ams Oil to take care of my truck

I use Ams oil in every application of my truck and never have I been let down

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by MURF: space

YES

IN A DODGE SPRINTER

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by 4B RANCH: space

amsoil synthetic with EAO filters

I have three diesel trucks and five diesel tractors, and all are serviced with Amsoil products. Besides extended oil changes, my engines stay clean and trouble free. I would never consider using anything else.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Randy: space

I would buy again and have continued to buy this oil.

I have used this oil for over 18 years in a 7.3 diesel ford-350 4x4 and have had great performance in using it .The engine doesn't have to work as hard with Amsoil synthetic oil 5-40w it runs cooler and less RPMs for the same speed as other oils . If you're not using Amsoil synthetic oils in your engine and truck and or other motor vechicle your missing out on the best performance your motor Vechicles can give you ..

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by engr: space

l6x diesel oil

looks good. I will need more time to fully evaluate it.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by truckguy12: space

Great premium diesel oil IMO

Premium oil for a premium price. Works out in the long run for me with extended drain intervals. I use it in all my diesel business trucks.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Trev: space

Awesome product

I use amsoil in all my vehicles, even my lawn mower. This stuff is the bomb, less oil pressure due to better flow, and smother running etc...

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by J: space

Great oil for your engine

Great oil for you engine can't go wrong with full synthetic. Other then manufacture recommendation on oil brand this is the only other brand I use. I'm still old school so 5k oil intervals is cheap insurance for a $67k truck. Oil itself is amazing compared to previous oil used at 5k miles drains Amsoil looks and feels great. Smoother engine idle and smoother engine operation at higher rpm range. I have a digital psi gauge installed and with Amsoil the engine oil psi has maintained same psi throughout the oil intervals the oil temperatures has dropped 8 degrees lower under same driving conditions. I know that's not a professional oil analysis but it's what I've got.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Steve: space

I will definitely buy this oil again

I use amsoil in everything I own, from vintage snowmobiles to outboard motors to stihl concrete saws to my cummins to my jeep crd. I swear by your products and have switched a number of people over to it. It's cheap insurance especially when you plan on keeping your investments for a long time. It's the only oil I can count on

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by DWC521: space

Great product!

My 2016 F350 6.7L runs smoother on this oil

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Hurst: space

2016 Ram Eco Diesel

I notice a big difference in mileage and how the truck ran after changing the factory oil to Amsoil. The mileage is up over brand X that I replaced. I've used Amsoil in all my diesel trucks, no complaints!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by mistercedric: space

Excellent oil

I have used this oil for many years in my 3500 GMC. A recent trip of 11000 km with the 25000 mile oil filter did not change the color of the oil it was still as if it came out of the container. Excellent starting in cold weather

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ivan: space

Excellent Stuff!

Great oil at better than dealership prices.
Why wouldnt you?

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by 100 MPH: space

Excellent

I love this oil I rely on it with my lively hood. Great stuff.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Danny Boy: space

Trust

I don't know if my 2013 Ram diesel is protected better by using Amsoil motor oil, but I trust Amsoil research. I believe what Amsoil claims. I can only say this about Amsoil. Only time will tell as the engine ages.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Tamworthsat: space

Great

I would buy this top grade again because I once bought the XL grade and notice a slight drop in mileage.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

Nothing else for my diesel truck

I have been using Amzoil in my 2008 Dodge Ram 2500 since the first oil change. I currently have 147,000 miles on it and it doesn't burn a drop of oil, runs smooth and has a ton of power. I believe that using a quality oil with regular oil changes is the key. This stuff is not cheap! Neither is this truck! But to replace it is $68,000. I think the Amzoil is going to give me that quarter million mile mark.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by -King D: space

Too much sauce

Perfect

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Benny: space

I have more faith in this product.

I work my diesel trucks hard. Pull heavy loads 100% of the time. When it's 0° and they start up with quicker oil pressure and less engine clatter, or when it's 95° out and I'm wide open throttle for miles up a long steep grade and my oil temps maintain a steady temperature, I feel more confident my engine will last longer with Amsoil.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by 204man: space

Love it

Cold start 2016 cummins. -23. No problem. Amazing in cold temps.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Frank: space

Only the BEST for Me

I have been using Amsoil since 1979 and I believe in putting the Best Oil in all my Toys . I use it in my cars,garden tractor , lawn mower , whole house generator , power washer , and my 2 Corvettes ,and in my 2013 Kioti CK35 HST Diesel tractor . I guess you could call me an Amsoil Junkie 😎

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Arthur: space

Loyal customer

I just changed the oil in my 2015 with Amsoil for the first time, because the truck came with 2 years of maintenance when bought new, and if you didn't use it your just wasting money.i am a firm believer in Diesel injector clean, I'm on my second Duramax and have never had a fuel related problem. I'll use Amsoil forever.
Thanks for great products.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Clay: space

Works good in cold weather.

08 Duramax 250k miles and still going strong. -30 here in winter, starts up with good oil pressure no waiting on the pressure gauge to pick up cold oil.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JERRY: space

I change my own oil - have for 30 years. Always Amsoil.

When Amsoil produced a oil meeting Chrysler's requirements (2015 Jeep GC 3.0 Diesel) I jumped on it as I have always had good experience with Amsoil oil.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Marc: space

Best oil for my Cummins,

Only product I use. The BEST!

I use it with AMSOIL FF and bypass filters.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Rob: space

Best 15-40 diesel oil on the market

Excellent product, my 2005 Cummins runs smoother than it ever has. I feel very confident pulling some of the heavy loads that I do, knowing that this oil will stand up to whatever I can put it through.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mark: space

I'm going to continue using this product.

Very pleased with the purchase. Regens intervals have increased by a significant margin, particularly in the city driving.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Jeff: space

I will stick with Amsoil.

I've been using this in my 2004 Dodge Cummins diesel for 12 years and 120,000 miles and it still runs like it was new.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Douglas: space

5 Star's will always use amsoil

Best oil on the market ! My 2011 Ford F 250 6.7 deisel has 99.687 miles on it and uses no oil between changes !!!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Dk: space

Winter start

Truck not plugged in -40c slow crank still started. I believe 5-40 made the difference. Good oil

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Novy: space

great

Been using this oil for a while and like it. Cold weather starts a breeze!!!!!!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by big boy: space

outstanding diesel oil.

could not think of a better oil. longevity, performance, and mileage difference is evident. recommend it for all diesel vehicles. No complaints.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Ihmachine: space

Great product would recommend.

I use amsoil in my 07 diesel truck, I have 7,000 miles on the oil change and still clean according to the lab test! I've used amsoil in different motors and I'm a believer, this oil is spectacular from my personal experience.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by BWW: space

My Ford F250 diesel loves it.

Have been using this product in my 2011 ford diesel since day one. I put on about 14,000 miles a year and change my oil once a year. I have never had to add oil between oil changes. I'm amazed even at change time the oil is still so clear its hard to read the dip stick. Ive been trying to figure out something to put on the dip stick to see the oil easier.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Kevin: space

Easy starting in Canada's North

I have been using AMSOIL Premium 5W-40 Synthetic Diesel Oil for the last five years and I have never had any issues starting when the temperature drops below -30C/-22F.

I switched to AMSOIL after my first winter because I was not happy with the cold weather starting performance of other full-synthetic diesel oils.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Master Bear: space

The Best!!

Amsoil Premium 5W-40 Synthetic Diesel Oil is the best! I have used it on my diesel vehicles for years, and have been quite satisfied with its longevity and performance.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by JP: space

Excellent oil

2011 F250 6.7L. Great oil with great customer service to back it.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

A Verified Buyer is an individual who has purchased the reviewed product and submitted their review through a specific process that tracks purchase history.Reviewed by Mike: space

Will be buying this for years to come

Excellent performance in my 6.7 power stroke

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)

Reviewed by Ronald Glen: space

Much smoother than RT6

Switched over my 6.0 Powerstroke to Amsoil DEO. After some contemplation, I decided to go with Amsoil for few dollars more than Rotella. I am glad with the decision as the engine has become noticeably smoother. This indicates lower internal friction which will translate into longer engine life. I am already getting 50-70 miles more miles per tank of diesel, which justifies for the slight premium in the price.

Also it appears that I can go longer on the oil. I personally don't believe & was not planning on extended drain intervals as suggested by Amsoil. But with the way things are going, I feel comfortable going 50% more on the oil, which again justifies the higher cost of the oil.

I'll continue with Amsoil DEO, its working out to be lot less expensive than RT6.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 5W-40 (DEO)
Discussion Url

Re: Much smoother than RT6

To overcome extended drain anxiety, consider doing used oil analysis 1000 miles before scheduled oil change.

You can confidently, continue with the oil if the report indicates all the levels to be within spec. Repeat the oil analysis again until the report recommends changing the oil.

This is the most informed and scientific way to establish oil drain intervals. We see conventional oils breaking down below spec before their scheduled interval, indicating accelerated engine wear (even with frequent and regular oil changes). Therefore, the condition of the oil should be the factor that call for an oil change. Replied by Tech Admin
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