AMSOIL Signature Series Max-Duty Synthetic Diesel Oil 5W-40
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Maximum-duty protection for your hardest-working diesel engines

Signature Series Max-Duty Synthetic Diesel Oil 5W-40 Product Image
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$11.50 Retail Price (USD)
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Product Code: DEOQT-EA
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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
  • Allison TES439
  • 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.

DEO Package Sizes
Code Package Size Unit of Measure Product
DEOQT (DEOQT-EA) Quart Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEOQT (DEOQT-CA) Quart Case of 12 Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO1G (DEO1G-EA) Gallon Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO1G (DEO1G-CA) Gallon Case of 4 Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEOTP (DEOTP-EA) 2.5-Gallon Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEOTP (DEOTP-CA) 2.5-Gallon Case of 2 Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO30 (DEO30-EA) 30-Gallon Drum Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO55 (DEO55-EA) 55-Gallon Drum Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO27 (DEO27-EA) 275-Gallon Tote Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
More about AMSOIL Reviews

REVIEW SNAPSHOT®

by PowerReviews
AMSOILSignature Series Max-Duty Synthetic Diesel Oil 15W-40
 
4.9

(based on 182 reviews)

Ratings Distribution

  • 5 Stars

     

    (170)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (3)

  • 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 182 customers

Displaying reviews 1-10

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5.0

I LIKE THIS OIL

By 

from Manhattan KS

Verified Buyer

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

I bought a new GMC 3500 Duramax in 2005. The first OIL change was AMSOIL Max Duty Diesel pool 15W-40. With this OIL I only need to change OIL once a year (AMSOIL recommends once every 20000 miles) and I only have 10k per year. The OIL is costly but with the perfered fostered card ($20.00 per year) you save in the long run.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • I'm an ever with a 36ft 5th wheel coach.
 
5.0

Oil works as advertised

By 

from Maryland

Verified Buyer

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

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.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • 2012 F450
 
5.0

Great product

By 

from OR

Verified Buyer

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

Very affordable and an excellent product!

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 1999 dodge Ram 3500
 
5.0

I will buy again

By 

from Custer SD

Verified Buyer

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

Great

  • How would you describe yourself?:
  • I love my vehicles / toys
 
5.0

I will be buying this again for my grandson

By 

from Nestor Falls, Ontario Canada

Verified Buyer

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

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.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • autos,boats,atvs,motorcycles
 
5.0

Awesome products

By 

from Stroudsburg pa

Verified Buyer

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

Use Amsoil in all my vehicles and toys.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Cars trucks quads side-by-sides
 
5.0

Great product

By 

from Delanco, NJ

Verified Buyer

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

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

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

It's good stuff

By 

from Wabash, IN

Verified Buyer

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

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

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2015 Ram 1500 Ecodiesel
 
5.0

Awesome

By 

from Wa state

Verified Buyer

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

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

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Cars, suv, trucks, tractors
 
5.0

Great product

By 

from Houston

Verified Buyer

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

I will continue to use this product.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Tracks, Tractors

Displaying reviews 1-10

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