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 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 Premium 5W-40 Synthetic Diesel Oil
DEOQT (DEOQT-CA) Quart Case of 12 Premium 5W-40 Synthetic Diesel Oil
DEO1G (DEO1G-EA) Gallon Each Premium 5W-40 Synthetic Diesel Oil
DEO1G (DEO1G-CA) Gallon Case of 4 Premium 5W-40 Synthetic Diesel Oil
DEOTP (DEOTP-EA) 2.5-Gallon Each Premium 5W-40 Synthetic Diesel Oil
DEOTP (DEOTP-CA) 2.5-Gallon Case of 2 Premium 5W-40 Synthetic Diesel Oil
DEO30 (DEO30-EA) 30-Gallon Drum Each Premium 5W-40 Synthetic Diesel Oil
DEO55 (DEO55-EA) 55-Gallon Drum Each Premium 5W-40 Synthetic Diesel Oil
DEO27 (DEO27-EA) 275-Gallon Tote Each Premium 5W-40 Synthetic Diesel Oil
More about AMSOIL Reviews

REVIEW SNAPSHOT®

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

(based on 146 reviews)

Ratings Distribution

  • 5 Stars

     

    (137)

  • 4 Stars

     

    (7)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (0)

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 146 customers

Displaying reviews 1-10

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5.0

Great product!

By 

from Ohio

Verified Buyer

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

Engine runs quiter and seem to get better fuel mileage. Very happy with the oil product.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Dodge cummins
 
5.0

Diesel oil

By 

from Everett wa

Verified Buyer

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

I like this oil in my 99 ford power stroke. Holds up well.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 99 ford power stroke diesel.
 
5.0

I only run this oil in my diesels

By 

from Grande Prairie AB

Verified Buyer

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

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.

  • How would you describe yourself?:
  • I use AMSOIL products for my business
 
5.0

I would buy this product again and again!

By 

from San Angelo, Texas

Verified Buyer

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

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.

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2014 Dodge Ram EcoDiesel.
 
5.0

Like 6x protection

By 

from Florida and beyond

Verified Buyer

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

Under heavy usage and need peace of mind

  • How would you describe yourself?:
  • I use AMSOIL products for my business
  • What kind of vehicle/equipment do you have?:
  • Cdi
 
5.0

Will always use this oil

By 

from Stuart Fl

Verified Buyer

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

Use this oil in a tow vehicle never loses a drop of oil in 5000 miles

  • How would you describe yourself?:
  • I'm a professional mechanic
  • What kind of vehicle/equipment do you have?:
  • 2016 2500 Denali Diesel
 
5.0

Hands down the best oil

By 

from Everywhere

Verified Buyer

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

I run this stuff in my Duramax and have since I bought it in 12'. It holds up to whatever I put the truck through. Best bang for the buck on the market.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2008 Dirtymax CC with go-fast parts
 
5.0

Amsoil

By 

from NEWPORT Michigan

Verified Buyer

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

Although I've never use this oil before I'm confident I'll love it as I've been useing it in my M/c for years ! You just can't go wrong with amsoil!

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 17 ram cummns , 03 Harley D Fatboy!
 
5.0

Must be good

By 

from Holt MI

Verified Buyer

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

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

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2015 F350 6.7L
 
5.0

Switch conventional oil to Synthetic oil

By 

from TN

Verified Buyer

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

Being a new customer to Amsoil, I've read lots of reviews and spoke with Amsoil Tech several times, and lots of satisfied customers before making the switch. I'm still a few thousand miles away before the first oil change. This is with Amsoil oil filter. With all the above sad, I'm very satisfied with the product and the technicians.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • 2011 GMC 3500 2013 GMC Acadia

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