AMSOIL Signature Series Max-Duty Synthetic Diesel Oil 15W-40
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Signature Series Max-Duty Synthetic Diesel Oil 15W-40Help

Maximum-duty protection for your hardest-working diesel engines

Signature Series Max-Duty Synthetic Diesel Oil 15W-40 Product Image
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$11.30 Retail Price (USD)
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Product Code: DMEQT-EA
Product Highlights View Full Description

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.

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.

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.

Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222
Oil Consumption

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

  • 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

Official Oil

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.

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.

1Refer 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 Safety Data Sheet (SDS). USA and Canada (M)SDS are available upon request at 715-392-7101 or on the AMSOIL Website. Keep Out of Reach of Children. Don’t pollute. Return used oil to collection centers.

AMSOIL PRODUCT WARRANTY
AMSOIL products are backed by a Limited Liability Warranty. For complete information visit www.amsoil.com/about/guarantee.aspx.

* All trademarked names and images are the property of their respective owners and may be registered marks in some countries. No affiliation or endorsement claim, express or implied, is made by their use. All products advertised here are developed by AMSOIL for use in the applications shown.

DME Package Sizes
Code Package Size Unit of Measure Product
DMEQT (DMEQT-EA) Quart Each Signature Series Max-Duty Synthetic Diesel Oil 15W-40
DMEQT (DMEQT-CA) Quart Case of 12 Signature Series Max-Duty Synthetic Diesel Oil 15W-40
DME1G (DME1G-EA) Gallon Each Signature Series Max-Duty Synthetic Diesel Oil 15W-40
DME1G (DME1G-CA) Gallon Case of 4 Signature Series Max-Duty Synthetic Diesel Oil 15W-40
DMETP (DMETP-EA) 2.5-Gallon Each Signature Series Max-Duty Synthetic Diesel Oil 15W-40
DMETP (DMETP-CA) 2.5-Gallon Case of 2 Signature Series Max-Duty Synthetic Diesel Oil 15W-40
DME30 (DME30-EA) 30-Gallon Drum Each Signature Series Max-Duty Synthetic Diesel Oil 15W-40
DME55 (DME55-EA) 55-Gallon Drum Each Signature Series Max-Duty Synthetic Diesel Oil 15W-40
DME27 (DME27-EA) 275-Gallon Tote Each Signature Series Max-Duty Synthetic Diesel Oil 15W-40
More about AMSOIL Reviews

REVIEW SNAPSHOT®

by PowerReviews
AMSOILSignature Series Max-Duty Synthetic Diesel Oil 5W-40
 
4.9

(based on 166 reviews)

Ratings Distribution

  • 5 Stars

     

    (155)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (2)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (0)

99%

of respondents would recommend this to a friend.

Most Liked Positive Review

 

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...Read complete review

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.

VS

Most Liked Negative Review

 

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...Read complete review

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.

Reviewed by 166 customers

Displaying reviews 1-10

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5.0

This is the best diesel oil out there.

By 

from Boston, MA

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 5W-40:

Excellent at every point.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • All trucks, gas/diesel and cars
 
5.0

Great product

By 

from Cold lake, AB

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 5W-40:

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

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2012 Ram 3500
 
5.0

I would buy this product again

By 

from Gp

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 15W-40:

Engine

  • How would you describe yourself?:
  • I'm a professional mechanic
  • What kind of vehicle/equipment do you have?:
  • Truck
 
5.0

This product is great.

By 

from Poway, CA

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 15W-40:

Since using Signature Series Amsoil in my F350 7.3 my truck is quieter and my mileage has increased. This oil is a miracle, I've been working on vehicles for over 40 years and this product has given me the best results of any lubricant ever.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • F350 4X4 7.3
 
5.0

7.3L Diesel vs cold weather

By 

from North Eastern Ohio

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 15W-40:

In addition to long interval oil changes my oil has to get me through all four seasons especially the cold North Eastern winters. I've tried many brands of oil and Amsoil Signature Series has proven to be the best. Cold starts no longer an issue if I forget to plug in my truck overnight or just leave it off for a shift at work. I really like this oil and trust Amsoil products.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • 2003 Ford Superduty 7.3L Diesel
 
5.0

Only Use AMSOIL Products

By 

from Naples,FL

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 15W-40:

Used the diesel oil in my bosses 2004 Chevy 3/4 ton 2500 PU,After this demo,will use in all equipment

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2005 Toyota Sienna,2011 KIA Sorento,
 
4.0

Still looking at results

By 

from Prineville, Or

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 15W-40:

Diesel motorhome and 2004 Ford PSD.
1998 Jeep Wrangler and 2015 Jeep Cherokee.
All lubes in all my cars are Amsoil.
I will use nothing else.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Diesel motorhome and F250, 2 Jeeps.

(0 of 1 customers found this review helpful)

 
5.0

I will continue to use each time

By 

from AZ

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 15W-40:

Great product, will use each time I change oil

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • chevy 2500HD duramax diesel
 
5.0

Yeah

By 

from Long Island New York

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 15W-40:

This is the best oil I have ever used this oil makes every other oil look like valve grinding compound

  • How would you describe yourself?:
  • I'm a professional mechanic
  • What kind of vehicle/equipment do you have?:
  • Duramax race truck
 
5.0

I've always used Amsoil products in my 2007 Dodge

By 

from Anacortes, WA

Verified Buyer

Comments about Signature Series Max-Duty Synthetic Diesel Oil 5W-40:

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.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2007 Dodge 2500 5.9 Diesel

Displaying reviews 1-10

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