Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (DME)
 Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (DME)

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:

1-Quart Bottle
1-Gallon Bottle
2.5-Gallon Bottle
30-Gallon Drum
55-Gallon Drum
275-Gallon Tote

Product Code: DME • Brand: AMSOIL




MSDS Data Sheet

Product Details Tech Data Reviews & Rating

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
• 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 DME.

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 (DME)
Kinematic Viscosity @ 100°C, cSt (ASTM D-445)15.6
Kinematic Viscosity @ 40°C, cSt (ASTM D-445)112.4
Viscosity Index (ASTM D-2270)147
CCS Viscosity @ -20°C, cP (ASTM D-5293)4134
Pour Point °C (°F) (ASTM D-97)-40 (-40)
NOACK Volatility, % weight loss (g/100g) (ASTM D5800)5.1
Total Base Number (ASTM D2896)10.1
High-Temperature/High-Shear Viscosity, cP (ASTM D5481)4.5
Sulfated Ash Content, wt. % 1.0

Did this product meet your expectations?

(click on a star to rate)
Product Name: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (DME)
Current Rating: 4.81 out of 5 stars
Total Votes: 34 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 Kevin: space

Best all around

2007 Dodge 6.7, engine never sounded smoother. Best investment I've made.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 California Buckeye: space

An oil company I rely on.....

Everything I own I use Amsoil in. 2 stroke, 4 stroke, car, truck, trailer, motorcycles... Everything!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Dabear: space

I have bought this again and again.

Diesel

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 T: space

Best oil you can buy

I run this in my 07 duramax it extended my oil change interval from every 5000 miles to every 12000 miles and my truck runs cooler plus I picked up over a mile per gallon on fuel mileage

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Nica: space

Yes

I noticed I get a better fuel gas mileage

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 L.: space

12 years and counting

I have been running this oil for over 12 years on my F350 7.3L Diesel. Still running strong.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

I will continue to use Amsoil in all my vehicles.

Always quality. I run this in my 2009 Ram 6.7 Cummins. Been running nothing but Amsoil since I bought it in 2010 and no issues.
I also use Amsoil Signature 5w30 in my hotrods too. I have a 1967 Chevelle SS with Chevrolet crate 502 as well as a 2013 Camaro SS 1LE
I never worry about oil related issues with Amsoil.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

5 years and counting

I have used this product in my 05 Dodge 2500 for over 5 years and hasn't let me down. Great protection and good in the could mouths with could starting

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

New GMC Denali

Bought a new GMC Denali and I will use NO other oil it a $60K plus vehicle!

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Eldon: space

I trust Premium 15W-40 Synthetic Diesel Oil in my truck.

This is the only oil I have used in my 2008 Chevy 3500 HD truck since the first oil change. At this time it is not a high mileage truck and generally change the oil due to time limitation and not mileage. However when the truck is being used it is under somewhat severe conditions and I trust Amsoil to take care of it. I will not at this time consider any other engine lubricant for this truck.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (DME)

Reviewed by Dk: space

Winter start

Truck not plugged in -40c slow crank still started. I believe 5-40 made the difference. Good oil.
2005 dodge 2500 5.9 cummins
I would recommend this to a friend.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (DME)
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 Uncle Denny: space

25000 mile oil and filter

I've been using AMS 15w-40 and the 25000mile filter for over 170,000 miles and have been completely satisfied.The fact that I don't have to take the time to get an oil change every 3000 to 5000 miles helps a guy like me who's on call 24/7.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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: space

Great product

Using the premium synthetic oil in a 03 cummins, instantly noticed the truck idling better. Glad to extend time between oil changes as well.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 RMS: space

Great Product

I think the products are great. Been using them for a long time.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Larry: space

DODGE RAM RUNNING LIKE NEW

I began using AMSOIL 15w-40 Synthetic Diesel oil 3 years ago. I can tell a definite difference in the performance of the truck & there has been increased fuel mileage with & without towing my 5th-wheel. I also have extended the interval of oil changes to 15,000 to 18,000 miles.
Based on my positive results with this product I also had my transmission fluid changed to Amsoil.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

Premium 15W-40 Synthetic Diesel Oil

I Can always count on great quality and fast shipments from Amsoil. I have only used there product on my 2007 GMC Diesel truck from the day I purchased it brand new.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 RVer Al: space

Amsoil Premium 15W-40 Synthetic Diesel Oil

This product ROCKS! Have used it in my diesel truck since my first oil change in 2006. My truck has 170,000 miles and still runs like a top and still pulls my 5th wheel all over the USA. Also use an Amsoil oil filter and together they are the best in my humble opinion.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 climbs Colorado 14 teeners: space

Synthetic Oils are by far the Best

I use The 15-40W in my 2014 Ram 3500 with a Cummins 6.7 diesel engine. I pull a cargo trailer daily for my construction business and also have a 40 foot 5th wheel trailer that I am on the road with 45 - 60 days a year. I never have to worry if the engine is being well lubricated.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Mat: space

It works

I have been using amsoil in my truck form the day I got it about 5 years ago, Chevy silverado 2500hd Duramax and I have to change my injectors out at 169000 miles the inside of my engine was so clean you could have ate off it. I now have 240000 miles on the truck and drive it as a daily driver over a 100 miles a day. And still use amsoil

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 L: space

Great product. Will be buying more in the near future

Our duramax is a daily driver along with pulling a 43 ft toy hauler. I will be purchasing other products also.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 ASAPIE: space

Great product

I have used this product for many years and I have had great results. I am glade I came across amsoil the product has saved me alot of money.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

I will never stop using it

Duramax 6.6 runs quiet excellent feul mileage

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Bruce: space

2011 Chevrolet diesel truck

Have used AMS Oil for years and it has performed as advertised. Was always a little tough to find a salesperson close to home now it is very simple to order and delivery was fast.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 killer tom: space

Oil change on a 6.7 Cummins

Did an oil change and filter and first week I notice that the engine had smoothed out , and my mileage went from 11.3 liters per 100 k down to 10.6, that's just in 22 kilometer ride to work .Can't wait for a highway run coming in September.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 ca2500: space

Not worth the cost in my opinion

Can't say I had any issue in my 2014 Duramax but for the cost I will be buying something else. I just cant stand lettingmy truck go 10k++ miles on a single oil change but that's just me.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 onetexasoldman: space

shipping

have always used Amsoil
had my order within a couple days very fast

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

Extended drain intervals

I operate a 2013 Ram 3500 I use Amsoil oil along with Amsoil bypass filtration for a 45000 mile oil change intervals with clean oil analysis

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

Premium 15-40 diesel oil

Been using the oil since the vehicle had reached 25000 miles. Now it has just short of 120,000 miles. The oil lasts one year. I notice no oil comsumsion between oil changes. Use the truck to pull trailers beside just normal driving. Also belive that the oil aids in cold starts during the winter months. Starting in sub zero weather has not been an issue as todate.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

Excellent Product

I switched from the standard Rotella 15W-40 about 1.5 years ago to the Amsoil 15W-40, and was the best thing I could have done! Though some of the new diesels are rated for 7500 mile oil changes, when using Rotella I still changed it every 3k miles. With the new emissions on these trucks, the regular oil doesn't last near as long. After only 3k miles, the oil was almost as thin as water, and the lubricity was nearly gone.
After switching to Amsoil, I can go the full 7500 miles and then some (with oil analysis), and the oil still feels like new. I have since started using Amsoil to replace all the fluids in my truck.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Underwaydayz: space

Great Product

Amazing. I have noticeable temperature drops. I run it past the recommended oil change intervals, although that is not recommended. Combined with the Wix filter and it starts easy, runs cooler, and longer intervals. Not a single bad thing to say.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Oscar the Fishaholic: space

My Brother Convinced Me

My brother has owned an F250 Diesel for over 10 years. He told me that his truck performs the same as it did 10 years ago and he has had no fuel injector or motor problems. His friends have had those kinds of problems with their trucks. The difference he said is that he has been using AMSoil in this engine and transmission, and his friends did not. So when I bought my GMC 2500HD Diesel, I bought AMSoil for my truck. Their record is impressive. If I can trust my brother, who can I trust?

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

I have used this oil since 1984.

I have used this oil in my own Cummins engines since 1996.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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

Happy Camper!

I have been using Amsoil in my diesel towing vehicles sense 2004, when I purchased my first diesel GMC 2500 pickup. I tow a 10,000 pound Airstream Travel Trailer 10,000 to 15,000 miles a year, and change my oil one time each year. I have used an Amsoil Duai Filter System with the Bypass filter. I change the Full Flow Filter two times per year, and the Bypass filter one time. I got my oil analyzed each year just before my oil change for six years. I never had the lab recommend I change the oil. I put 125,000 miles om my first Amsoil truck, then sold it to a friend in 2014. The oil I am reviewing was bought for that friend, that is stil towing a Travel Trailer and changing the oil like I did.
I now have a 2015 Chevy 3500 Diesel set up just like my 2004 GMC was for Amsoil and dual filters. The order for this oil also included the oil and filters for my new truck. I look forward to getting the same results with this truck doing the same job.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 R.V. Transporter: space

The best oil out there!

I use Amsoil in my 2015 F-250. This oil holds up under the stresses that come with running 11 hrs. a day 5 days a week in commercial use. My 2015 already has 155k miles on it thanks to Amsoil, without any engine problems. I have tried other oils, even Royal Purple Duralec, but none compare to the 15-40's strengths when under the high temperatures of Summer in the south and the cold temperatures of the north in Winter.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Bryan: space

I put nothing but Amsoil in my vehicles

I have been using Amsoil for many years I use nothing but Amsoil in my vehicles I have a Duramax diesel 6.6 2011 In my opinion Amsoil is the best synthetic oil on the market .

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (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 Smart business owner: space

Top quality products con artists distributor

Have used amsoil but stopped because the distributor was trying to get me to invest into get rich quick schemes

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (DME)

Reviewed by Bill Ward: space

Oil of choice for my Duramax

I am using the 15W-40 Premium Synthetic from AMSOIL right from new, enjoying extended drains and great fuel mileage. The truck is 9 months old and has 87,000 km already, also switched the transmission and diffs over to AMSOIL.

Item Reviewed: Signature Series Max-Duty Synthetic CK-4 Diesel Oil 15W-40 (DME)
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