About this item

• Product Overview

  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

  ^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.

• Technical Specifications
  Data Bulletin

  Data Bulletins

  Literature Sample

  AMSOIL Diesel Oil Comparison Chart

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  4.9 star rating

  Based on 314 reviews

  Based on 314 reviews

  See all customer reviews

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  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    First time using this product
    By  HENRY,  a  Verified Buyer  from  Whitesboro Texas   on  June 01, 2026

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    This is the first time I ever use this product so I will wait and see how it works after I get a test done after my first oil change with this product
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Awesome product
    By  DOUG,  a  Verified Buyer  on  May 14, 2026

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    Yes I will keep buying this product
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great product.
    By  JACK,  a  Verified Buyer  from  Bolivar, TN  on  May 08, 2026

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    Another great product from AMSOIL. I use AMSOIL products in all my internal combustion engines from lawnmowers to high performance outboard engines. I feel like I’m doing the best I can to protect my engines.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great stuff
    By  JUSTIN,  a  Verified Buyer  from  Steens, MS  on  May 04, 2026

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    My Duramax just runs smoother with Amsoil.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Keeps my 11 year old Ram Eco Diesel turning
    By  CRAIG,  a  Verified Buyer  from  Eastern Washington state  on  April 28, 2026

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    My truck's mileage is now is 120k plus. I switched quite a while ago from STP Euro full synthetic. I was using that because the dealer was using that oil when I bought it used. (Free changes etc.) For the last seven changes, on average between 8k to 10k miles between, I've been using Amsoil. The truck runs great, no smoking, no leaking. I have to admit, I was dragging my feet about Amsoil until people I know kept talking about it. What made me switch was Gale Bank's video series about Amsoil and their factory. I'd been "Amway ambushed" at one time, so I was leery of the name. Amsoil has NOTHING WHATSOEVER to do with 'selling soap to your friends and relatives' company! I will be using Amsoil as long as I have this truck. (No plans to get rid of it)
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Great protection
    By  CURTIS,  a  Verified Buyer  from  Canada  on  April 26, 2026

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    Works as intended.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    works great
    By  PETE,  a  Verified Buyer  from  Nevada  on  March 24, 2026

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    it's great oil been using it for 40 years with no issues
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Great oil
    By  Steve,  a  Verified Buyer  from  Elizabethtown, Ky  on  March 24, 2026

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    Been using Amsoil for several years, it’s a bit more expensive but WELL worth it.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Good oil
    By  TREVOR,  a  Verified Buyer  from  Canada  on  March 23, 2026

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    I’ve been running Amsoil in all of toys for years. I’ve recently starting using it in my truck. The truck starts easier and builds oil pressure quicker in -30 starts. Truck is quieter and idles smoother in cold temperatures with this oil as well.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Duramax kit
    By  MICHAEL,  a  Verified Buyer  from  Kamloops   on  March 14, 2026

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    Great company great oil- only issue I had was with ordering - got a oil change kit and when checking out it said some of my stuff wasn’t ready- package shipped right away I assumed it was all there but I was short 2 liters of oil but not charged for it. Not ideal when you want to do an oil change.
    Bottom Line

    Yes, I would recommend this to a friend.
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• Highlights

  • 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

• Returns

  We offer easy returns for customers. If your product is unused and unopened, you may return it within 30 days for a full refund of the purchase price. View full AMSOIL Return Policy.

• Payments

  We accept Visa, Mastercard, American Express, Discover and PayPal, and provide secure checkout and encrypted payment processing.

• Product Overview

  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

  ^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.

• Technical Specifications
  Data Bulletin

  Data Bulletins

  Literature Sample

  AMSOIL Diesel Oil Comparison Chart

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  4.9 star rating

  Based on 314 reviews

  Based on 314 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    First time using this product
    By  HENRY,  a  Verified Buyer  from  Whitesboro Texas   on  June 01, 2026

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    This is the first time I ever use this product so I will wait and see how it works after I get a test done after my first oil change with this product
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Awesome product
    By  DOUG,  a  Verified Buyer  on  May 14, 2026

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    Yes I will keep buying this product
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great product.
    By  JACK,  a  Verified Buyer  from  Bolivar, TN  on  May 08, 2026

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    Another great product from AMSOIL. I use AMSOIL products in all my internal combustion engines from lawnmowers to high performance outboard engines. I feel like I’m doing the best I can to protect my engines.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great stuff
    By  JUSTIN,  a  Verified Buyer  from  Steens, MS  on  May 04, 2026

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    My Duramax just runs smoother with Amsoil.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Keeps my 11 year old Ram Eco Diesel turning
    By  CRAIG,  a  Verified Buyer  from  Eastern Washington state  on  April 28, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    My truck's mileage is now is 120k plus. I switched quite a while ago from STP Euro full synthetic. I was using that because the dealer was using that oil when I bought it used. (Free changes etc.) For the last seven changes, on average between 8k to 10k miles between, I've been using Amsoil. The truck runs great, no smoking, no leaking. I have to admit, I was dragging my feet about Amsoil until people I know kept talking about it. What made me switch was Gale Bank's video series about Amsoil and their factory. I'd been "Amway ambushed" at one time, so I was leery of the name. Amsoil has NOTHING WHATSOEVER to do with 'selling soap to your friends and relatives' company! I will be using Amsoil as long as I have this truck. (No plans to get rid of it)
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great protection
    By  CURTIS,  a  Verified Buyer  from  Canada  on  April 26, 2026

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    Works as intended.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    works great
    By  PETE,  a  Verified Buyer  from  Nevada  on  March 24, 2026

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    it's great oil been using it for 40 years with no issues
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great oil
    By  Steve,  a  Verified Buyer  from  Elizabethtown, Ky  on  March 24, 2026

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    Been using Amsoil for several years, it’s a bit more expensive but WELL worth it.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Good oil
    By  TREVOR,  a  Verified Buyer  from  Canada  on  March 23, 2026

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    I’ve been running Amsoil in all of toys for years. I’ve recently starting using it in my truck. The truck starts easier and builds oil pressure quicker in -30 starts. Truck is quieter and idles smoother in cold temperatures with this oil as well.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Duramax kit
    By  MICHAEL,  a  Verified Buyer  from  Kamloops   on  March 14, 2026

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    Great company great oil- only issue I had was with ordering - got a oil change kit and when checking out it said some of my stuff wasn’t ready- package shipped right away I assumed it was all there but I was short 2 liters of oil but not charged for it. Not ideal when you want to do an oil change.
    Bottom Line

    Yes, I would recommend this to a friend.
    Was this review helpful?

    YES (0) NO (0)