About this item

• Product Overview

  Synthetic, high-zinc formula fights wear. Built for hydrostatic transmissions to maintain mower speed and efficiency better than motor oil. Promotes long transmission life for professionals who depend on their equipment to make a living.

  See the product data sheet for full details.

  MAXIMIZES MOWER SPEED & RESPONSIVENESS

  • Zinc-based additives fight wear to maintain motor-wheel tolerances and proper oil pressure.
  • Resists viscosity loss in extreme heat for maximum mower speed and responsiveness.

  COMMERCIAL-GRADE WEAR PROTECTION

  • Forms a thick, durable film on gear teeth and other components to guard against metal-to-metal contact and wear.
  • Resists mechanical shear and viscosity loss for excellent wear protection and long transmission life.
  • Maintains protective viscosity despite extreme heat to ensure strong protection.

  MAINTAINS CLEANLINESS

  • Naturally heat-resistant synthetic base oils help reduce deposits.
  • Promotes component cleanliness for peak efficiency and excellent performance season after season.

  See the product data sheet for full details.

  *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.

• Technical Specifications

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  SDS (French)

  
  
  

• Product Reviews

  5 star rating

  Based on 60 reviews

  Based on 60 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    The best out there.
    By  DANIEL,  a  Verified Buyer  on  October 17, 2026

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    Best hydro oil out there for zero turns and HD garden tractors with hydraulic transmission.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    cadet zero turn mower hydros
    By  BARRY,  a  Verified Buyer  from  Pennsylvania  on  August 22, 2026

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    good stuff , since putting it in my mower zero turn the hydros are working much better. thanks
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Formulated for hydro drives.
    By  Uncleike,  a  Verified Buyer  from  Rural Florida  on  July 15, 2026

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    My thirteen year old hydrostatic transmissions have been mowing rural acreage for a lot of hours. I am convinced the only reason they have not failed is I take the time to drain and replace the fluid. Heat is the enemy of equipment like this and I believe Amsoil 20W-50 is perfect for this application. The manual suggested "SAE 30W", I'm sure this product is an upgrade.
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Toro hydro oil change
    By  Bob,  a  Verified Buyer  from  Venice, Fl  on  July 06, 2026

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    The left hydro on my toro mower felt like it was jumping when I rode on a hillside . After changing the hydro filters and replacing with amsoil 20W-50 hydro trans fluid it feels real smooth now.
    Bottom Line

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

    YES (4) NO (0)
  • 5 star rating
    Excellent for SCAG Hydro Units
    By  MIROSLAV,  a  Verified Buyer  from  Franklin, TN  on  July 01, 2026

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    I did a hydro system flush at 200 hours on my SCAG V-Ride II 61” which utilizes dual Hydro-Gear pumps and Parker wheel motors. After switching to the AMSOIL, it ran noticeably smoother and quieter. I use the mower for a large residential acreage with several hills. I’m also running the specific small engine oil. Very happy knowing my commercial mower is running quality fluid and should extend the service life for many hours/seasons to come.
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    Zero Turn hydro oil
    By  STEVEN,  a  Verified Buyer  from  GA  on  June 18, 2026

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    Excellent Hydro OiI !! After changing to this oil my zero turn mowers hydro pumps run quieter and smoother than ever! I have an Exmark Lazer that has 2500 hours on the pumps!! This oil has made that many hours on my original hydro gear pumps possible! Thanks Amsoil!! Steven
    Bottom Line

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

    YES (3) NO (0)
  • 5 star rating
    Zero turn mower
    By  JAIME,  a  Verified Buyer  on  June 15, 2026

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    Transaxles stay cool run smoother and less pump noise with ams oil.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    I put it in a troy built zero turn lawnmower
    By  ANTHONY,  a  Verified Buyer  on  June 15, 2026

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    It took the noise away and feels much smoother in response on the controls
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    John Deere hydrostatic transmission service
    By  CARL,  a  Verified Buyer  from  Ohio  on  June 01, 2026

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    Used the Amzoil 20w50 synthetic oil to service transmission on John Deere D125 with 270 hours on it. A bit of wining before service. The 20w50 works great, no wining and lawn tractor runs great!
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Definitely an upgrade
    By  Jim,  a  Verified Buyer  from  Kentucky  on  May 27, 2026

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    Far superior lubrication. Hydro drives run smoother, cooler and cleaner than with any other 20W-50 oil I have used. I mow 2 acres 1-2 times per week on hills. Creates a lot of heat in the oil. My expansion tanks show much cleaner oil. The drives are quieter than they were before. What else can I say? Great product.
    Bottom Line

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

    YES (2) NO (0)

• Highlights

  • Fights wear for smooth, responsive operation
  • Purpose-built to outperform motor oils
  • Resists high heat and shear

• 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

  Synthetic, high-zinc formula fights wear. Built for hydrostatic transmissions to maintain mower speed and efficiency better than motor oil. Promotes long transmission life for professionals who depend on their equipment to make a living.

  See the product data sheet for full details.

  MAXIMIZES MOWER SPEED & RESPONSIVENESS

  • Zinc-based additives fight wear to maintain motor-wheel tolerances and proper oil pressure.
  • Resists viscosity loss in extreme heat for maximum mower speed and responsiveness.

  COMMERCIAL-GRADE WEAR PROTECTION

  • Forms a thick, durable film on gear teeth and other components to guard against metal-to-metal contact and wear.
  • Resists mechanical shear and viscosity loss for excellent wear protection and long transmission life.
  • Maintains protective viscosity despite extreme heat to ensure strong protection.

  MAINTAINS CLEANLINESS

  • Naturally heat-resistant synthetic base oils help reduce deposits.
  • Promotes component cleanliness for peak efficiency and excellent performance season after season.

  See the product data sheet for full details.

  *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.

• Technical Specifications

  Data Bulletin

  Data Bulletins

  Warranty

  WARRANTY

  SDS

  SDS

  SDS (French)

  
  
  

• Product Reviews

  5 star rating

  Based on 60 reviews

  Based on 60 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    The best out there.
    By  DANIEL,  a  Verified Buyer  on  October 17, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Best hydro oil out there for zero turns and HD garden tractors with hydraulic transmission.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    cadet zero turn mower hydros
    By  BARRY,  a  Verified Buyer  from  Pennsylvania  on  August 22, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    good stuff , since putting it in my mower zero turn the hydros are working much better. thanks
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Formulated for hydro drives.
    By  Uncleike,  a  Verified Buyer  from  Rural Florida  on  July 15, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    My thirteen year old hydrostatic transmissions have been mowing rural acreage for a lot of hours. I am convinced the only reason they have not failed is I take the time to drain and replace the fluid. Heat is the enemy of equipment like this and I believe Amsoil 20W-50 is perfect for this application. The manual suggested "SAE 30W", I'm sure this product is an upgrade.
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Toro hydro oil change
    By  Bob,  a  Verified Buyer  from  Venice, Fl  on  July 06, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    The left hydro on my toro mower felt like it was jumping when I rode on a hillside . After changing the hydro filters and replacing with amsoil 20W-50 hydro trans fluid it feels real smooth now.
    Bottom Line

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

    YES (4) NO (0)
  • 5 star rating
    Excellent for SCAG Hydro Units
    By  MIROSLAV,  a  Verified Buyer  from  Franklin, TN  on  July 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I did a hydro system flush at 200 hours on my SCAG V-Ride II 61” which utilizes dual Hydro-Gear pumps and Parker wheel motors. After switching to the AMSOIL, it ran noticeably smoother and quieter. I use the mower for a large residential acreage with several hills. I’m also running the specific small engine oil. Very happy knowing my commercial mower is running quality fluid and should extend the service life for many hours/seasons to come.
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    Zero Turn hydro oil
    By  STEVEN,  a  Verified Buyer  from  GA  on  June 18, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Excellent Hydro OiI !! After changing to this oil my zero turn mowers hydro pumps run quieter and smoother than ever! I have an Exmark Lazer that has 2500 hours on the pumps!! This oil has made that many hours on my original hydro gear pumps possible! Thanks Amsoil!! Steven
    Bottom Line

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

    YES (3) NO (0)
  • 5 star rating
    Zero turn mower
    By  JAIME,  a  Verified Buyer  on  June 15, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Transaxles stay cool run smoother and less pump noise with ams oil.
    Was this review helpful?

    YES (1) NO (0)
  • 5 star rating
    I put it in a troy built zero turn lawnmower
    By  ANTHONY,  a  Verified Buyer  on  June 15, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    It took the noise away and feels much smoother in response on the controls
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    John Deere hydrostatic transmission service
    By  CARL,  a  Verified Buyer  from  Ohio  on  June 01, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Used the Amzoil 20w50 synthetic oil to service transmission on John Deere D125 with 270 hours on it. A bit of wining before service. The 20w50 works great, no wining and lawn tractor runs great!
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Definitely an upgrade
    By  Jim,  a  Verified Buyer  from  Kentucky  on  May 27, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Far superior lubrication. Hydro drives run smoother, cooler and cleaner than with any other 20W-50 oil I have used. I mow 2 acres 1-2 times per week on hills. Creates a lot of heat in the oil. My expansion tanks show much cleaner oil. The drives are quieter than they were before. What else can I say? Great product.
    Bottom Line

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

    YES (2) NO (0)