About this item

• Product Overview

  SEVERE GEAR is designed for those who demand the best. Engineered with high film strength for high-load demands. Reduces friction and provides the ultimate protection against wear. Excels in extreme temperatures. Helps maintain efficiency and outperforms conventional gear oils. Excellent for all cars and trucks, but especially well-suited for towing, hauling, racing, commercial use or other severe duty.

  See the product data sheet for full details.

  EXCELS IN TEMPERATURE EXTREMES

  • Delivers excellent performance in hot and cold temperature extremes.
  • Resists breakdown from high heat, preventing acids and carbon/varnish formation.
  • Wax-free construction improves cold-flow properties, improving fuel economy and cold-weather shifting.

  ---

  MAXIMUM WEAR PROTECTION

  • Specifically engineered for maximum performance in severe-duty applications.
  • Maintains viscosity for long-lasting protection against metal-to-metal contact.
  • Proprietary AMSOIL additives form an iron-sulfide barrier coating on gear surfaces, providing the ultimate line of defense against wear, pitting and scoring.
  • Helps prevent "thermal runaway," a phenomenon caused by a lubricant’s inability to control friction and increased heat under high-stress conditions.
  • Inhibits rapid lubricant degradation and component damage, helping equipment run better and last longer.

  *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.

   

  See the product data sheet for full details.

• Technical Specifications
  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  5 star rating

  Based on 122 reviews

  Based on 122 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    The best!
    By  MARK,  a  Verified Buyer  from  Tennessee   on  May 13, 2026

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    I use this in the front diff. On my TYM 4820R tractor. Works great! The best gear oil on the market.
    Bottom Line

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

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    Works as attended.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    All my Vehicles
    By  FRANK,  a  Verified Buyer  from  San Jose, Ca.   on  March 21, 2026

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    Any of my vehicles that use this viscosity I use Amsoil gear oil. 2017 Ram 3500, 2019 Jeep JL, 1996 Tacoma
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Severe Gear 80W-90
    By  HARRY,  a  Verified Buyer  from  New Jersey  on  March 19, 2026

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    Just filled the front differential of a Zumbrota 4:10 rebuilt Gear set in my 2005 Silverado. Already did the 500 mile break-in with the same Valvoline weight, break-in is clean, no metal. Refilled it with Amsoil. Rebuilt differential is very smooth and quiet with Amsoil. I never paid up for the higher end stuff before, but my mechanic labor and sore back is getting harder in my 70's :) YES, Folks pay the extra $ for the Amsoil, its a Quality product..
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Review of 80W-90 100% synthetic gear lube
    By  ZENON,  a  Verified Buyer  from  Depue, Illinois   on  February 05, 2026

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    Best gear fluid on market. Keeps my diffs on my 2012 Ford F150 Raptor SVT in perfect operating condition.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Amsoil bumper to bumper
    By  JAMES,  a  Verified Buyer  from  Corvallis Oregon  on  December 28, 2025

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    I was already using and loving Amsoil in the engine of my 1986 Toyota 4Runner, and when the rear axle oil seals went out at 675K miles, I changed to Amsoil gear lube. Changed the transmission and transfer case also, now my rig is running 100% Amsoil and at 905,822 miles it's going strong. I tell all my friends about Amsoil when I can.
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Amsoil Works
    By  WILLIAM,  a  Verified Buyer  from  Eastern California  on  November 28, 2025

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    Changed the differential gear oil with Amsoil in my 2004 f150, it had a slight whine to it. Now it's gone mostly gone big difference.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Quiet...
    By  Burnzy,  a  Verified Buyer  from  Mountain Home AR  on  November 14, 2025

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    I have a 2019 Honda Talon 1000X. The sub trans has been chattering for a long time. I tried different oils and they helped. Amsoil stopped the chattering. A great product in my book...
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great replacement option
    By  VICTOR,  a  Verified Buyer  from  TX  on  November 09, 2025

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    Easy convenient packaging makes the fluid fills easy. Happy I went with AMSOIL, seems like a legitimate option.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Peace of mind for drivetrain
    By  ROBERTOM,  a  Verified Buyer  from  Washington, DC  on  October 05, 2025

    Open report issue form

    Describe the issue

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    Amsoil products not only perform over time, they perform in places like differentials or PTUs and transfer cases that can be forgotten. I trust that Amsoil will last until time to service again. Amsoil performance isn't an anecdote, it is proven with analysis that the chemistry matches the marketing.
    Bottom Line

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

    YES (1) NO (0)

• Highlights

  • Advanced protection against wear
  • Controls thermal runaway
  • Protects against rust and corrosion
  • Helps reduce operating temperatures
  • Long oil, seal & equipment life
  • Contains friction modifiers for limited-slip applications
• 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

  SEVERE GEAR is designed for those who demand the best. Engineered with high film strength for high-load demands. Reduces friction and provides the ultimate protection against wear. Excels in extreme temperatures. Helps maintain efficiency and outperforms conventional gear oils. Excellent for all cars and trucks, but especially well-suited for towing, hauling, racing, commercial use or other severe duty.

  See the product data sheet for full details.

  EXCELS IN TEMPERATURE EXTREMES

  • Delivers excellent performance in hot and cold temperature extremes.
  • Resists breakdown from high heat, preventing acids and carbon/varnish formation.
  • Wax-free construction improves cold-flow properties, improving fuel economy and cold-weather shifting.

  ---

  MAXIMUM WEAR PROTECTION

  • Specifically engineered for maximum performance in severe-duty applications.
  • Maintains viscosity for long-lasting protection against metal-to-metal contact.
  • Proprietary AMSOIL additives form an iron-sulfide barrier coating on gear surfaces, providing the ultimate line of defense against wear, pitting and scoring.
  • Helps prevent "thermal runaway," a phenomenon caused by a lubricant’s inability to control friction and increased heat under high-stress conditions.
  • Inhibits rapid lubricant degradation and component damage, helping equipment run better and last longer.

  *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.

   

  See the product data sheet for full details.

• Technical Specifications
  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  
  
  
• Product Reviews
  5 star rating

  Based on 122 reviews

  Based on 122 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    The best!
    By  MARK,  a  Verified Buyer  from  Tennessee   on  May 13, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I use this in the front diff. On my TYM 4820R tractor. Works great! The best gear oil on the market.
    Bottom Line

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

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

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Works as attended.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    All my Vehicles
    By  FRANK,  a  Verified Buyer  from  San Jose, Ca.   on  March 21, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Any of my vehicles that use this viscosity I use Amsoil gear oil. 2017 Ram 3500, 2019 Jeep JL, 1996 Tacoma
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Severe Gear 80W-90
    By  HARRY,  a  Verified Buyer  from  New Jersey  on  March 19, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Just filled the front differential of a Zumbrota 4:10 rebuilt Gear set in my 2005 Silverado. Already did the 500 mile break-in with the same Valvoline weight, break-in is clean, no metal. Refilled it with Amsoil. Rebuilt differential is very smooth and quiet with Amsoil. I never paid up for the higher end stuff before, but my mechanic labor and sore back is getting harder in my 70's :) YES, Folks pay the extra $ for the Amsoil, its a Quality product..
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Review of 80W-90 100% synthetic gear lube
    By  ZENON,  a  Verified Buyer  from  Depue, Illinois   on  February 05, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Best gear fluid on market. Keeps my diffs on my 2012 Ford F150 Raptor SVT in perfect operating condition.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Amsoil bumper to bumper
    By  JAMES,  a  Verified Buyer  from  Corvallis Oregon  on  December 28, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I was already using and loving Amsoil in the engine of my 1986 Toyota 4Runner, and when the rear axle oil seals went out at 675K miles, I changed to Amsoil gear lube. Changed the transmission and transfer case also, now my rig is running 100% Amsoil and at 905,822 miles it's going strong. I tell all my friends about Amsoil when I can.
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Amsoil Works
    By  WILLIAM,  a  Verified Buyer  from  Eastern California  on  November 28, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Changed the differential gear oil with Amsoil in my 2004 f150, it had a slight whine to it. Now it's gone mostly gone big difference.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Quiet...
    By  Burnzy,  a  Verified Buyer  from  Mountain Home AR  on  November 14, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I have a 2019 Honda Talon 1000X. The sub trans has been chattering for a long time. I tried different oils and they helped. Amsoil stopped the chattering. A great product in my book...
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great replacement option
    By  VICTOR,  a  Verified Buyer  from  TX  on  November 09, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Easy convenient packaging makes the fluid fills easy. Happy I went with AMSOIL, seems like a legitimate option.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Peace of mind for drivetrain
    By  ROBERTOM,  a  Verified Buyer  from  Washington, DC  on  October 05, 2025

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Amsoil products not only perform over time, they perform in places like differentials or PTUs and transfer cases that can be forgotten. I trust that Amsoil will last until time to service again. Amsoil performance isn't an anecdote, it is proven with analysis that the chemistry matches the marketing.
    Bottom Line

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

    YES (1) NO (0)