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. 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.

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/warranty.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
AMSOILPremium 5W-40 Synthetic Diesel Oil
 
4.9

(based on 99 reviews)

Ratings Distribution

  • 5 Stars

     

    (91)

  • 4 Stars

     

    (7)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

99%

of respondents would recommend this to a friend.

Most Liked Positive Review

 

Easy starting in Canada's North

I have been using AMSOIL Premium 5W-40 Synthetic Diesel Oil for the last five years and I have never had any issues starting when the temperature drops below -30C/-22F.
Read complete review

I have been using AMSOIL Premium 5W-40 Synthetic Diesel Oil for the last five years and I have never had any issues starting when the temperature drops below -30C/-22F.

I switched to AMSOIL after my first winter because I was not happy with the cold weather starting performance of other full-synthetic diesel oils.

VS

Most Liked Negative Review

 

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...Read complete review

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.

Reviewed by 99 customers

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5.0

Great product

By 

from Illinois

Verified Buyer

Comments about Premium 15W-40 Synthetic Diesel Oil:

I'm using this in my Onan air cooled generator in my motorhome.
Has run all day in some fairly hot temperatures (mid 90s) with no oil breakdown and generator uses Very little oil between scheduled changes.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Tiffin Allegro Bay and Saturn Vue
 
5.0

Did what I was hoping it would do

By 

from Halifax, NS

Verified Buyer

Comments about Premium 5W-40 Synthetic Diesel Oil:

I put this in my Kabota BX25
I was hoping it would quiet the motor and make for easy starting on cold inter days.
It did quite the motor a lot.
Started with no issues.

  • How would you describe yourself?:
  • I'm a full-on gearhead
  • What kind of vehicle/equipment do you have?:
  • 2016 Kabota BX25
 
5.0

Truly amazing.

By 

from Camano Island, WA

Verified Buyer

Comments about Premium 15W-40 Synthetic Diesel Oil:

I'm using this in my diesel pick up. I can't believe how much smoother it runs. And the mileage improved so much I thought the trip computer was broken.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • 2003 Dodge diesel Ram
 
5.0

Great product

By 

from Texas City, Texas

Verified Buyer

Comments about Premium 15W-40 Synthetic Diesel Oil:

Amsoil is a great oil. I personally change oil in 8 automobiles and light trucks. Also 1 motorcycle and two lawnmowers. My highest mileage is 200250 miles. I can tell you that Amsoil and their filters will do a superior job. The only down side is the shipping charges. Amsoil is priced about the same as Mobile 1, but the charges mean you pay top dollar.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • I have from 60's muscle car to 2017 pick
 
5.0

Protection and flexibility

By 

from Ct.

Verified Buyer

Comments about Premium 15W-40 Synthetic Diesel Oil:

I use this product for two reasons. It offers me excellent protection and performance in
my Diesel engines and because the durability is so good I have flexibility on my service
schedule. My schedule may change and the weather here in New England doesn't always cooperate
and these products let me service at my convenience.

  • How would you describe yourself?:
  • I'm a DIY handyman
  • What kind of vehicle/equipment do you have?:
  • Diesel trucks,tractors,boats, equipment
 
5.0

Great oil unbeatable

By 

from Temecula cal

Verified Buyer

Comments about Premium 5W-40 Synthetic Diesel Oil:

New 2017 ford diesel. Outstanding oil. Highly recommend it. Would only use this oil in my new Diesel engine It is so high tech

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • 2017 ford f350
 
5.0

Great product

By 

from Oklahoma

Verified Buyer

Comments about Premium 5W-40 Synthetic Diesel Oil:

Ran for 8 thousand miles & love it so far

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

Nothing but the best for my vehicles

By 

from Manheim PA

Verified Buyer

Comments about Premium 15W-40 Synthetic Diesel Oil:

so far so good . I believe in Amsoil . I expect the best from this oil . My vehicles depends on it ! I run this in everything I own!!!

  • How would you describe yourself?:
  • I love my vehicles / toys
  • What kind of vehicle/equipment do you have?:
  • Motorcycle, Truck, Mower, Tahoe
 
5.0

Great stuff.

By 

from Vista, CA

Verified Buyer

Comments about Premium 15W-40 Synthetic Diesel Oil:

I use it in conjunction with the Amsoil bypass filter.
Usually Change oil after 20,000 miles or so.

It's great oil, as is your trans and differential oil.

  • How would you describe yourself?:
  • I'm a professional mechanic
  • What kind of vehicle/equipment do you have?:
  • 2008 Dodge 2500. 6.7 Cummins & 96 Dodge
 
5.0

Correct oil and filter, ready and waiting for pickup.

By 

from Mississauga, ON

Verified Buyer

Comments about Premium 5W-40 Synthetic Diesel Oil:

I like to do my own oil changes, and avoid all the "additional" services the dealer offers.

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

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