Skip to Main Content
Close Icon

Main Menu

Begin typing to search, use arrow keys to navigate, Enter to select.
Roll over image to zoom in

Heavy-Duty Synthetic Diesel Oil 5W-40

Product code : ADOQT-EA

• Delivers 4X more wear protection1
Minimizes oil consumption
Excels in extreme temperatures
Helps keep trucks and equipment operating at peak performance
Offers outstanding value

1Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 10W-30 as worst-case representation

• Delivers 4X more wear protection1
Minimizes oil consumption
Excels in extreme temperatures
Helps keep trucks and equipment operating at peak performance
Offers outstanding value

1Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 10W-30 as worst-case representation

Heavy-Duty Synthetic Diesel Oil 5W-40



Developed to provide protection beyond conventional, synthetic-blend and other synthetic oils. AMSOIL synthetic technology delivers heavy-duty protection for diesel enthusiasts and those who depend on their trucks and equipment to make a living.

See the Product Data Bulletin for full details.


HEAVY-DUTY ENGINE PROTECTION

  • Delivers 4X more wear protection1
  • Helps maximize equipment life
  • Helps reduce maintenance costs and downtime

1Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 10W-30 as worst-case representation

Delivers More Wear Protection

Third-party testing shows Heavy-Duty Synthetic Diesel Oil delivers 4X more protection against wear than required by Detroit Diesel’s* standard.I

IBased on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 10W-30 as worst-case representation. *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.


VISCOSITY CONTROL

  • Resists oxidation and the thickening effects of soot contamination
  • Retains viscosity after high-temperature service for added engine protection and increased fuel economy
  • Provides up to 66 percent less oil consumption2

2Than required by the API CK-4 standard in the Caterpillar-1N oil consumption test

Reduces Oil Consumption

Heavy-Duty Synthetic Diesel Oil provides up to 66% less oil consumption.L

Reduces Oil Consumption – Heavy-Duty Synthetic Diesel Oil provides up to 66% less oil consumption.

L Than required by the API CK-4 standard in the Caterpillar-1N oil consumption test.


EXCELS IN EXTREME TEMPERATURES

  • Provides outstanding protection and performance in hot and cold temperature extremes
  • Delivers improved heat and oxidation resistance compared to conventional diesel oils
  • Flows dependably in cold temperatures for easier startup and improved engine protection

See the Product Data Bulletin for full details.

Heavy-Duty Synthetic Diesel Oil 5W-40



Heavy-Duty Synthetic Diesel Oil 5W-40

  • 5 star rating
    Excellent
    By  BRYON,  a  Verified Buyer  from  Tooele, Utah  on  September 15, 2022
    Excellent oil for my truck.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    The only oil I will use in my diesel truck
    By  Augie,  a  Verified Buyer  from  MN  on  August 25, 2022
    This is great oil and a good price it's the only oil I will put in my diesel truck
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Diesel oil
    By  MICHAEL,  a  Verified Buyer  on  August 14, 2022
    I decided to go with Amsoil I was introduced to it in the 80’s it was expensive back then so I went with Mobil1 had know issues with Mobil1 but there’s a big difference I can see already been in my Dodge Ram for three weeks now and it is still clear to the eye. Mobil1 would definitely be black by now. All I’m saying is Amsoil has made a believer out of me. I got the differential oil so that’s my next change. Good stuff will recommend
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Awesome oil
    By  Doug,  a  Verified Buyer  from  Leduc  on  August 05, 2022
    Great Product Awesome service
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 4 star rating
    5-40 diesel oil
    By  BRENT,  a  Verified Buyer  from  Black hills So Dak  on  August 04, 2022
    Great product I own a 6.4 powerstroke and I switched from conventional non synthetic oil to amsoil and the tic stopped! Highly recommended
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 4 star rating
    To early to tell
    By  KEVIN,  a  Verified Buyer  on  June 03, 2022
    After hearing all the hype I decided to give amsoil a shot. I drive a 2015 F-350 6.7 powerstroke. I was a little disappointed To hear the dreaded typewriter tick as soon as I fired it up. I’ll run it for a while and change it again and see how it does on the second oil change. So Far I’m happy with it, the way it was shipped left a lot to be desired though. The box it came in had arrows saying this side up and both 2.5 gallon jugs were packaged upside down on their caps. They also forgot the free gift I was supposed to get which was like pulling teeth to get a replacement sent out.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    great product
    By  DONNIE,  a  Verified Buyer  from  GA  on  May 31, 2022
    it works
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great Oil
    By  DAVID,  a  Verified Buyer  on  May 30, 2022
    Just put this in my John Deere 1025R sub compact tractor. Sound better and runs smoother. When I first fired up the tractor after the oil change, i could not believe how much smoother the tractor run at idle and all the way up to full throttle. At this point in time, I'll never use another oil in this tractor. Great stuff.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great product
    By  CHARLES,  a  Verified Buyer  on  May 27, 2022
    I actually use this in a 07 Canyon and 14 Outback. The canyon burns 5w30 but not this. The outback burned a quart every 1000 miles of the 0w20, switched to 0w40 and burns a quart every 4000, I’ll try this in it and see. Next step will be 5w50. Outback is just a complete pos.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Amsoil selection and service
    By  JEFF,  a  Verified Buyer  from  Oregon  on  May 25, 2022
    I use Amsoil products in all of my vehicles. From my daily driver to watercraft. Amsoil products have great coverage. From turbo diesel to European. Racing products to gun care.. Oils, filters, coolants, cleaners and more. Fast shipping and great value. Thank you Amsoil, Jeff
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?