About this item

• Product Overview

  Developed to protect the horsepower diesel enthusiasts crave and extend the life of hard-working commercial equipment in the most severe conditions. Signature Series synthetic technology delivers max-duty protection in on- and off-road applications.

  See the Product Data Bulletin for full details.

  MAXIMUM ENGINE PROTECTION

  • Delivers 6X more wear protection,¹ delivering extra protection so you can push your diesel with peace of mind
  • Provides long-lasting wear protection, keeping cylinder liners looking like new²
  • Delivers up to 60 percent better turbo cleanliness³
  • Withstands the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower
  • Provides up to 2X better rust protection⁴

  ¹Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-30 as worst-case representation
  ²Based on independent testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15W-40 diesel oil using the Detroit Diesel* DD13 Scuffing test for specification DFS 93K222.
  ³Based on specification standards of CAT C13 2nd Ring Top Land Carbon testing
  ⁴Based on industry standard testing using the NMMA FC-W Rust Test.

  ---

  Delivers More Wear Protection

  Third-party testing shows Signature Series Max-Duty Synthetic Diesel Oil delivers 6X more protection against wear than required by Detroit Diesel’s* standard.^II

  ^IIBased on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-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.

  ---

  AMSOIL Fights Wear

  AMSOIL delivers powerful engine protection. How good is it? In third-party testing compared to a leading brand, AMSOIL provided long-lasting wear protection, keeping cylinder liners looking like new.^DD

  ^DDBased on third-party testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15W-40 diesel oil using the Detroit Diesel* DD13 Scuffing test for specification DFS 93K222.
  *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.

  ---

  Keeps Turbos Clean

  AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides protection boosted to the max, delivering up to 60% better turbo cleanliness^J and withstanding the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower.

  ^JBased on specification standards of CAT C13 2nd Ring Top Land Carbon testing

  ---

  Protects Against Rust

  Provides up to 2X better rust protection.^K

  ^KBased on industry standard testing using the NMMA FC-W Rust Test.

  ---

  VISCOSITY CONTROL

  • Resists oxidation and the thickening effects of soot contamination
  • Retains viscosity after high-temperature service for maximum engine protection and efficiency
  • Provides up to 76 percent less oil consumption⁵

  ⁵Than required by the API CK-4 standard in the Caterpillar-1N oil consumption test

  ---

  Reduces Oil Consumption

  Signature Series Max-Duty Synthetic Diesel Oil provides up to 76% less oil consumption.^L

  ^LThan 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
  • Resists thermal (heat) breakdown better than conventional and competing synthetic diesel oils.
  • Stays fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear.

  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

  SDS (French)

  
  
  
• Product Reviews
  4.8 star rating

  Based on 26 reviews

  Based on 26 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Amsoil products
    By  BRUCE,  a  Verified Buyer  from  Michigan   on  February 07, 2024

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    This oil I have been using for 20 years great stuff . My last truck had over a half a million miles on it was still going strong!!!!
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Confidence inspiriing
    By  KIRK,  a  Verified Buyer  from  Harpswell, ME   on  January 07, 2024

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    After being in transition for nearly a year and a half, I am finally settling down into my new home. Consequently, I have not changed my John Deere 2320 tractor oil in over a year. I've only put 40 or so hours on it but I try not to miss my annual oil change interval. Amsoil's MAX duty 5W30 motor oil has given me the confidence not to worry to much about that missed oil change. Will get to it in the next week or two. Fantastic protection/ confidence, and zero oil consumption on a Yanmar diesel with nearly 1000 hours on it.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great product
    By  DOUGLAS,  a  Verified Buyer  from  Fort Lauderdale fl   on  August 07, 2023

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    Only oil I use in my 2017 fuso fg4x4
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Most Trusted
    By  KENTON,  a  Verified Buyer  from  Alabama   on  June 20, 2023

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    I have been using nothing but Amsoil in my 2020 Chevy Colorado with the Duramax diesel. I did extensive research on the best Seidel oil and hands down Amsoil was the industry’s best. I have not been disappointed.
    Bottom Line

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

    YES (2) NO (0)
  • 3 star rating
    Confusing information
    By  GEORGE,  a  Verified Buyer  from  Upstate NY  on  January 21, 2023

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    I wrote Amsoil two times and two times, i received different information two times. I asked if there was any oil I could use in both my dodge ram diesel and my 2017 honda turbo hatchback. So I don't have to stock two kinds of oils. Both people wrote back different things . At first, they said this would work, then I questioned that and AMSOIL wrote back and the answer dept said this was no good for the Honda. So now IDK. I read all oil reports and Amsoil always beats everyone, but it beats me THEY do not know what i should be using. signed confused.
    Bottom Line

    No, I would not recommend this to a friend.
    Was this review helpful?

    YES (0) NO (2)
  • 5 star rating
    Noticably smoother
    By  PAUL,  a  Verified Buyer  from  Central Florida  on  November 13, 2022

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    Land Rover dealer will only put Castrol in, so I decided to do my own with Amsoil. Engine runs noticably smoother. My only wish is that this product was available in liter size quantity.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Works well in my kubota tractor
    By  RODNEY,  a  Verified Buyer  from  South Deerfield, Ma.  on  October 27, 2022

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    I have use this oil for years in my tractor that stays out in the cold. Have never had a problem starting it.
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    I believe in this stuff!
    By  PERRY,  a  Verified Buyer  from  Gatlinburg  on  August 07, 2022

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    I have used AMSOIL top grade diesel oil and the dual filter system in two GMC pickup trucks and have had no oil related problems with once per year oil changes. I have towed a 10,000 Airstream travel trailer over 200,000 miles during that time. I did regular oil analysis during the first 5 or so years, and never gol a recommendation to change the oil after 12 months of travel. I have condensed several people to make the change to a setup like mine for their tow vehicle with no complaints from any of them.
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    You want to get 5mpg ? Get this oil than
    By  JOSE,  a  Verified Buyer  from  Maryland   on  August 05, 2022

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    Describe the issue

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    I have a rotella 15-w40 oil in my car because people around here where saying the is the best for diesels and after using asmoil I found out the motor got quiet , smooth and idles better also gets better Milage So after finding this Amsoil oil i will never go back to use a different brand Give it a try and see for your self
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    John Deere tractor
    By  STEVE,  a  Verified Buyer  from  Battle Creek, Michigan   on  July 31, 2022

    Open report issue form

    Describe the issue

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    I put this in my tractor and is great! The tractor is exposed to heavy loads, dirt and dust and high RPMs. Oil is great under pressure and delivers.
    Bottom Line

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

    YES (1) NO (0)

• Highlights

  • Outstanding extreme-pressure protection
  • Delivers 6X more wear protection¹
  • Maintains proper viscosity (thickness)
  • Minimizes oil consumption
  • Maximizes fuel efficiency
  • Excels in extreme temperatures
  • Confidently extend drain intervals

     

    ¹Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-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 protect the horsepower diesel enthusiasts crave and extend the life of hard-working commercial equipment in the most severe conditions. Signature Series synthetic technology delivers max-duty protection in on- and off-road applications.

  See the Product Data Bulletin for full details.

  MAXIMUM ENGINE PROTECTION

  • Delivers 6X more wear protection,¹ delivering extra protection so you can push your diesel with peace of mind
  • Provides long-lasting wear protection, keeping cylinder liners looking like new²
  • Delivers up to 60 percent better turbo cleanliness³
  • Withstands the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower
  • Provides up to 2X better rust protection⁴

  ¹Based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-30 as worst-case representation
  ²Based on independent testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15W-40 diesel oil using the Detroit Diesel* DD13 Scuffing test for specification DFS 93K222.
  ³Based on specification standards of CAT C13 2nd Ring Top Land Carbon testing
  ⁴Based on industry standard testing using the NMMA FC-W Rust Test.

  ---

  Delivers More Wear Protection

  Third-party testing shows Signature Series Max-Duty Synthetic Diesel Oil delivers 6X more protection against wear than required by Detroit Diesel’s* standard.^II

  ^IIBased on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using 5W-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.

  ---

  AMSOIL Fights Wear

  AMSOIL delivers powerful engine protection. How good is it? In third-party testing compared to a leading brand, AMSOIL provided long-lasting wear protection, keeping cylinder liners looking like new.^DD

  ^DDBased on third-party testing of AMSOIL 5W-30 Signature Series Max-Duty Synthetic Diesel Oil and a leading conventional 15W-40 diesel oil using the Detroit Diesel* DD13 Scuffing test for specification DFS 93K222.
  *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.

  ---

  Keeps Turbos Clean

  AMSOIL Signature Series Max-Duty Synthetic Diesel Oil provides protection boosted to the max, delivering up to 60% better turbo cleanliness^J and withstanding the extra demands you place on the turbo when pulling heavy loads or updating the tune for maximum horsepower.

  ^JBased on specification standards of CAT C13 2nd Ring Top Land Carbon testing

  ---

  Protects Against Rust

  Provides up to 2X better rust protection.^K

  ^KBased on industry standard testing using the NMMA FC-W Rust Test.

  ---

  VISCOSITY CONTROL

  • Resists oxidation and the thickening effects of soot contamination
  • Retains viscosity after high-temperature service for maximum engine protection and efficiency
  • Provides up to 76 percent less oil consumption⁵

  ⁵Than required by the API CK-4 standard in the Caterpillar-1N oil consumption test

  ---

  Reduces Oil Consumption

  Signature Series Max-Duty Synthetic Diesel Oil provides up to 76% less oil consumption.^L

  ^LThan 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
  • Resists thermal (heat) breakdown better than conventional and competing synthetic diesel oils.
  • Stays fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear.

  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

  SDS (French)

  
  
  
• Product Reviews
  4.8 star rating

  Based on 26 reviews

  Based on 26 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    Amsoil products
    By  BRUCE,  a  Verified Buyer  from  Michigan   on  February 07, 2024

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This oil I have been using for 20 years great stuff . My last truck had over a half a million miles on it was still going strong!!!!
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Confidence inspiriing
    By  KIRK,  a  Verified Buyer  from  Harpswell, ME   on  January 07, 2024

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    After being in transition for nearly a year and a half, I am finally settling down into my new home. Consequently, I have not changed my John Deere 2320 tractor oil in over a year. I've only put 40 or so hours on it but I try not to miss my annual oil change interval. Amsoil's MAX duty 5W30 motor oil has given me the confidence not to worry to much about that missed oil change. Will get to it in the next week or two. Fantastic protection/ confidence, and zero oil consumption on a Yanmar diesel with nearly 1000 hours on it.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great product
    By  DOUGLAS,  a  Verified Buyer  from  Fort Lauderdale fl   on  August 07, 2023

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Only oil I use in my 2017 fuso fg4x4
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Most Trusted
    By  KENTON,  a  Verified Buyer  from  Alabama   on  June 20, 2023

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have been using nothing but Amsoil in my 2020 Chevy Colorado with the Duramax diesel. I did extensive research on the best Seidel oil and hands down Amsoil was the industry’s best. I have not been disappointed.
    Bottom Line

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

    YES (2) NO (0)
  • 3 star rating
    Confusing information
    By  GEORGE,  a  Verified Buyer  from  Upstate NY  on  January 21, 2023

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I wrote Amsoil two times and two times, i received different information two times. I asked if there was any oil I could use in both my dodge ram diesel and my 2017 honda turbo hatchback. So I don't have to stock two kinds of oils. Both people wrote back different things . At first, they said this would work, then I questioned that and AMSOIL wrote back and the answer dept said this was no good for the Honda. So now IDK. I read all oil reports and Amsoil always beats everyone, but it beats me THEY do not know what i should be using. signed confused.
    Bottom Line

    No, I would not recommend this to a friend.
    Was this review helpful?

    YES (0) NO (2)
  • 5 star rating
    Noticably smoother
    By  PAUL,  a  Verified Buyer  from  Central Florida  on  November 13, 2022

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Land Rover dealer will only put Castrol in, so I decided to do my own with Amsoil. Engine runs noticably smoother. My only wish is that this product was available in liter size quantity.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Works well in my kubota tractor
    By  RODNEY,  a  Verified Buyer  from  South Deerfield, Ma.  on  October 27, 2022

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have use this oil for years in my tractor that stays out in the cold. Have never had a problem starting it.
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    I believe in this stuff!
    By  PERRY,  a  Verified Buyer  from  Gatlinburg  on  August 07, 2022

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have used AMSOIL top grade diesel oil and the dual filter system in two GMC pickup trucks and have had no oil related problems with once per year oil changes. I have towed a 10,000 Airstream travel trailer over 200,000 miles during that time. I did regular oil analysis during the first 5 or so years, and never gol a recommendation to change the oil after 12 months of travel. I have condensed several people to make the change to a setup like mine for their tow vehicle with no complaints from any of them.
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    You want to get 5mpg ? Get this oil than
    By  JOSE,  a  Verified Buyer  from  Maryland   on  August 05, 2022

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have a rotella 15-w40 oil in my car because people around here where saying the is the best for diesels and after using asmoil I found out the motor got quiet , smooth and idles better also gets better Milage So after finding this Amsoil oil i will never go back to use a different brand Give it a try and see for your self
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    John Deere tractor
    By  STEVE,  a  Verified Buyer  from  Battle Creek, Michigan   on  July 31, 2022

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I put this in my tractor and is great! The tractor is exposed to heavy loads, dirt and dust and high RPMs. Oil is great under pressure and delivers.
    Bottom Line

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

    YES (1) NO (0)