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

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*, delivering the security of providing your diesel the extra protection it deserves.

*Based on independent testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using a 5W-30 as worst-case representation.

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.

Competition Service Life: Provides lasting protection for multiple events. Use oil analysis to determine appropriate drain interval.

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 5W-40
 
4.9

(based on 196 reviews)

Ratings Distribution

  • 5 Stars

     

    (183)

  • 4 Stars

     

    (8)

  • 3 Stars

     

    (3)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (1)

98%

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 196 customers

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5.0

this oil is really good

By 

from Québec, Canada

Verified Buyer

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

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

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Ram 1500 ecodiesel
 
5.0

I highly recommend this oil for extending your engine life

By 

from Cotopaxi, Co

Verified Buyer

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

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!!!!!

  • How would you describe yourself?:
  • I use AMSOIL products for my business
  • What kind of vehicle/equipment do you have?:
  • 2016 Ford f-350 CC 4X4 LWB
 
5.0

I will buy this again

By 

from Green Bay WI

Verified Buyer

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

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

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Ford F-250 Super Duty
 
5.0

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

By 

from Dallas TX

Verified Buyer

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

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.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2016 EcoDiesel, 2008 Escape, 2011 Cherok
 
5.0

Best oil ever

By 

from Alaska

Verified Buyer

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

Amsoil is the best oil products out there. I run heavy loads with my truck and travel a lot. I get great mileage out this oil and it holds up to the extreme temperatures here.

  • How would you describe yourself?:
  • I'm a professional mechanic
  • What kind of vehicle/equipment do you have?:
  • 2012 Chevy Silverado 2500HD
 
5.0

I would buy this product again

By 

from Sparks,NV

Verified Buyer

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

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.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 02 Ford F-250 Super Duty
 
5.0

Only Amsoil Will Do

By 

from WOODLAND, CA

Verified Buyer

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

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.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Diesel SUV,Farm equipment, small engines
 
5.0

I will buy this oil again

By 

from Stafford Virginia

Verified Buyer

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

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

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • buick GS Stage1Ram2500,BMW335D,427Vette
 
5.0

I continue to use this great product

By 

from Devils Lake, ND

Verified Buyer

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

I use this in a 2000 7.3 Ford Diesel. Motor has over 200,000 miles and still runs like a top. I will continue using Amsoil products; my engines run great and stand up very well with their products.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Too many to list.
 
5.0

Great Product!

By 

from Loudon TN

Verified Buyer

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

Been using this in my diesel truck for years with never a problem. Online ordering was quick and easy!

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2011 Chevy 3500HD DRW

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