About this item

• Product Overview

  Engineered for maximum performance in V-twin engines, motorcycle transmissions and primary chaincases. Protects against extreme heat. Wet-clutch compatible. Advanced synthetic formulation resists viscosity loss to keep critical components clean and protected.

  See the Product Data Bulletin for full details.

  REDUCES WEAR & DEPOSITS

  • Resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved protection against compensator and transmission gear wear.¹
  • Contains heavy treatment of anti-wear additives to reduce wear in the most extreme operating conditions.
  • Fortified with maximum levels of oxidation inhibitors to fight deposits for maximum engine compression and power.

  ---

  Resists Viscosity Breakdown

  AMSOIL resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved protection against compensator and transmission gear wear.¹

  ¹Based on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil and Harley-Davidson Screamin’ Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.

   

   

  ---

  WITHSTANDS EXTREME HEAT

  • Formulated with naturally heat-resistant synthetic base oils that resist oxidation in extreme summer heat and during strenuous stop-and-go rally or parade traffic.
  • Unique additive system helps keep engines clean and running efficiently in the toughest riding conditions.
  • Prevented piston-ring sticking and protected against piston scuffing after 1,000 miles (1,609 km) of extreme-heat dyno testing during which cylinder temperatures reached 421°F (216°C) (see video below).

   

   

  ---

  PROTECTS TRANSMISSIONS & PRIMARIES

  • Shear-stable formulation resists thinning from mechanical activity to protect transmissions and primaries from wear.
  • Performs like a gear lube without the negative effects of extreme-pressure additives.
  • Delivers the convenience of one lubricant for all three sumps.

  ---

  TRUSTED BY PROFESSIONALS

  AMSOIL Synthetic V-Twin Motorcycle Oil is the top choice of hardcore riders everywhere. Here’s what some have to say.

   

   

  See the Product Data Bulletin 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

  
  
  
• Product Reviews
  4.9 star rating

  Based on 1,660 reviews

  Based on 1,660 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    V-Twin
    By  MICHAEL,  a  Verified Buyer  from  Michigan  on  August 04, 2026

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    Buying direct of Amsoil is cheaper than buying from the stores. I like to buy in bulk so I have the oil available when I'm ready to do an oil change.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Freaking awesome oil
    By  MICHAEL,  a  Verified Buyer  from  Pocono Mountains Pa  on  August 04, 2026

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    I was using Harley syn3 15w-50 in my 2021 ultra limited and i would notice a lot of engine noise when it got hot and I been riding for a while in the heat, I did some research on line and found that a lot of Harley riders love this Amsoil for just that reason so figure I try it, and man I am glad I did engine sounds great after its been ridden all day on a hot summer day.. I will never go back to syn3 I will have to see how it does when the weather gets colder on these chilly mountain morning but for now I am loving it. Oh i am also going to be using it in my 2026 tacoma Thank you Amsoil
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    A1 Earl
    By  AL,  a  Verified Buyer  from  cad  on  August 03, 2026

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    This is some good Earl my man! The lubiest of lubes even.
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    My Bikes
    By  PETER S,  a  Verified Buyer  from  VA  on  July 31, 2026

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    I own Harleys, Triumphs, and Honda motorcycles and run Amsoil in all of them. Highly recommend.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    great oil
    By  TERRY,  a  Verified Buyer  from  Prtescott, Az.  on  July 30, 2026

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    This oil for motorcycles has a very high rating and it has been great for me
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Engine oil for 98 Harley heritage
    By  Jackson,  a  Verified Buyer  from  Alabama  on  July 30, 2026

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    I needed some quality heavy weight oil for Alabama summer. Engine runs smooth. Arrived fast in perfect condition.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Amsoil is the only oil I use for my bike.
    By  ROBERT,  a  Verified Buyer  from  Colorado   on  July 29, 2026

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    I've tried several brands of oil for my Harley Davidson, and Amsoil out performs them all.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Personal preference
    By  DUWAYNE,  a  Verified Buyer  from  Pulaski, Va  on  July 23, 2026

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    I like Amsoil because it really holds up under heat in these Harley twin cam air cool engines
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Product Review
    By  TERRENCE,  a  Verified Buyer  from  Spring Grove, IL  on  July 20, 2026

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    Product is the best on the market for all of my motorcycles.
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  • 5 star rating
    Great Lubricant
    By  ROBERT,  a  Verified Buyer  from  Peachtree City, GA 30269  on  July 17, 2026

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    Great oil.
    Bottom Line

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

  • Resists viscosity breakdown 6X better than Harley-Davidson* SYN3* for improved protection against compensator and transmission gear wear.¹
  • Resists extreme heat to help keep engines clean and efficient.
  • Reduces wear and deposits for maximum engine compression and power.
  • Convenience of one lubricant for all three sumps.

    *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.
    ¹Based on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil and Harley-Davidson Screamin’ Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.

• 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

  Engineered for maximum performance in V-twin engines, motorcycle transmissions and primary chaincases. Protects against extreme heat. Wet-clutch compatible. Advanced synthetic formulation resists viscosity loss to keep critical components clean and protected.

  See the Product Data Bulletin for full details.

  REDUCES WEAR & DEPOSITS

  • Resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved protection against compensator and transmission gear wear.¹
  • Contains heavy treatment of anti-wear additives to reduce wear in the most extreme operating conditions.
  • Fortified with maximum levels of oxidation inhibitors to fight deposits for maximum engine compression and power.

  ---

  Resists Viscosity Breakdown

  AMSOIL resists viscosity breakdown 6X better than Harley-Davidson SYN3 for improved protection against compensator and transmission gear wear.¹

  ¹Based on testing of AMSOIL 20W-50 Synthetic V-Twin Motorcycle Oil and Harley-Davidson Screamin’ Eagle SYN3 purchased on 1/26/24 in the CEC L45-KRL, ASTM D445 test.

   

   

  ---

  WITHSTANDS EXTREME HEAT

  • Formulated with naturally heat-resistant synthetic base oils that resist oxidation in extreme summer heat and during strenuous stop-and-go rally or parade traffic.
  • Unique additive system helps keep engines clean and running efficiently in the toughest riding conditions.
  • Prevented piston-ring sticking and protected against piston scuffing after 1,000 miles (1,609 km) of extreme-heat dyno testing during which cylinder temperatures reached 421°F (216°C) (see video below).

   

   

  ---

  PROTECTS TRANSMISSIONS & PRIMARIES

  • Shear-stable formulation resists thinning from mechanical activity to protect transmissions and primaries from wear.
  • Performs like a gear lube without the negative effects of extreme-pressure additives.
  • Delivers the convenience of one lubricant for all three sumps.

  ---

  TRUSTED BY PROFESSIONALS

  AMSOIL Synthetic V-Twin Motorcycle Oil is the top choice of hardcore riders everywhere. Here’s what some have to say.

   

   

  See the Product Data Bulletin 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

  
  
  
• Product Reviews
  4.9 star rating

  Based on 1,660 reviews

  Based on 1,660 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 5 star rating
    V-Twin
    By  MICHAEL,  a  Verified Buyer  from  Michigan  on  August 04, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Buying direct of Amsoil is cheaper than buying from the stores. I like to buy in bulk so I have the oil available when I'm ready to do an oil change.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Freaking awesome oil
    By  MICHAEL,  a  Verified Buyer  from  Pocono Mountains Pa  on  August 04, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I was using Harley syn3 15w-50 in my 2021 ultra limited and i would notice a lot of engine noise when it got hot and I been riding for a while in the heat, I did some research on line and found that a lot of Harley riders love this Amsoil for just that reason so figure I try it, and man I am glad I did engine sounds great after its been ridden all day on a hot summer day.. I will never go back to syn3 I will have to see how it does when the weather gets colder on these chilly mountain morning but for now I am loving it. Oh i am also going to be using it in my 2026 tacoma Thank you Amsoil
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    A1 Earl
    By  AL,  a  Verified Buyer  from  cad  on  August 03, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This is some good Earl my man! The lubiest of lubes even.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    My Bikes
    By  PETER S,  a  Verified Buyer  from  VA  on  July 31, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I own Harleys, Triumphs, and Honda motorcycles and run Amsoil in all of them. Highly recommend.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    great oil
    By  TERRY,  a  Verified Buyer  from  Prtescott, Az.  on  July 30, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    This oil for motorcycles has a very high rating and it has been great for me
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Engine oil for 98 Harley heritage
    By  Jackson,  a  Verified Buyer  from  Alabama  on  July 30, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I needed some quality heavy weight oil for Alabama summer. Engine runs smooth. Arrived fast in perfect condition.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Amsoil is the only oil I use for my bike.
    By  ROBERT,  a  Verified Buyer  from  Colorado   on  July 29, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I've tried several brands of oil for my Harley Davidson, and Amsoil out performs them all.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Personal preference
    By  DUWAYNE,  a  Verified Buyer  from  Pulaski, Va  on  July 23, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    I like Amsoil because it really holds up under heat in these Harley twin cam air cool engines
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Product Review
    By  TERRENCE,  a  Verified Buyer  from  Spring Grove, IL  on  July 20, 2026

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    Describe the issue

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    Cancel Submit
    Product is the best on the market for all of my motorcycles.
    Was this review helpful?

    YES (0) NO (0)
  • 5 star rating
    Great Lubricant
    By  ROBERT,  a  Verified Buyer  from  Peachtree City, GA 30269  on  July 17, 2026

    Open report issue form

    Describe the issue

    Failed to verify captcha

    Cancel Submit
    Great oil.
    Bottom Line

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

    YES (0) NO (0)