About this item

• Product Overview

  Friction-modifier-free formula helps rings seat properly for maximum compression and reduced blow-by. Excellent film strength and proprietary anti-wear additive package help ensure cams and bearings are protected during break-in. Delivers competition-quality engine preparation.

  See the product data sheet for full details.

  QUICKLY SEATS RINGS

  • Friction-modifier-free formula allows sharp peaks on newly honed cylinder walls to partially flatten, creating more surface area for rings to seat.
  • Forms a dynamic seal that increases compression, horsepower and torque.

  ---

  PROTECTS CRITICAL PARTS FROM WEAR

  • Contains high levels of zinc and phosphorus (ZDDP) additives.
  • Delivers excellent protection for splash-lubricated parts, like camshafts and lifters, during break-in.
  • Increased film strength protects rod and main bearings from wear.

   

  See the product data sheet for full details.

• Technical Specifications
  Data Bulletin

  Data Bulletins

  SDS

  SDS

  SDS (French)

  
  
  
• Product Reviews
  5 star rating

  Based on 77 reviews

  Based on 77 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 4 star rating
    User
    By  TYLER,  a  Verified Buyer  on  May 11, 2026

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    We have been using this oil for 3 years in a 7.90 jr dragster. It outperforms most name brand oils in Friction, heat brake down, and fuel contamination (alcohol) The only thing I noticed with this purchase was the color of the oil was a little darker out of the container, normally it's a bright red like transmission fluid. Not sure if there was a change in formula or there was a slight more zinc added by miss calibrated mixture?
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Great break-in pil
    By  JAMES,  a  Verified Buyer  on  May 09, 2026

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    All of the products were great, but I didn’t receive any gloves or funnels with my purchase.
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Just what the engine ordered
    By  DANA,  a  Verified Buyer  from  Kelowna  on  January 20, 2026

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    I recommend this to all my customers for break-in before going to the T4 !!
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Big dollar builds
    By  JEFF,  a  Verified Buyer  from  Indiana   on  November 30, 2025

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    Why would you want to use any other product on your investment?
    Bottom Line

    Yes, I would recommend this to a friend.
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    YES (0) NO (0)
  • 5 star rating
    Break in oil
    By  JAMES,  a  Verified Buyer  on  November 14, 2025

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    Great for junior dragster motors
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    Don’t hesitate to buy it worth every penny
    By  Gio,  a  Verified Buyer  on  August 04, 2025

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    Good quality oil
    Bottom Line

    Yes, I would recommend this to a friend.
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  • 5 star rating
    The proper oil!
    By  ROD,  a  Verified Buyer  from  Washington  on  July 02, 2025

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    I build custom street engines and racing engines. I've been using Break in oil in every engine for years. It has the proper additive package for flat tappet cam break in, plus limited friction modifiers to aid ring seating. Even in 900+hp sprint car engines we can see the EGT's change as the rings seat! GREAT product!
    Bottom Line

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

    YES (4) NO (0)
  • 5 star rating
    Great for newly rebuilt engine start up and break in.
    By  WAYNE,  a  Verified Buyer  from  Pennsylvania  on  July 01, 2025

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    I have used this for break in of several rebuilt engines. I never had a problem with flat tappet camshaft break in or ring seating.
    Bottom Line

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

    YES (3) NO (0)
  • 5 star rating
    wesome Break-in Oil
    By  DANIELE,  a  Verified Buyer  from  Windsor, Ontario, Canada  on  June 30, 2025

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    I have used this before a couple times and I would not use anything else as this has bee one of the best break-in oils I have ever used. I have just put together a SBC 383 stoker and I am about to put it on my engine start up stand to run it. I wish I could put a video of it on this review. Please Amsoil you should let us be able to put videos/pictures to our reviews to show what we are doing. Thank you for the best oil products out there.
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    Highly Trusted Brand
    By  DDM,  a  Verified Buyer  from  Cocoa, Florida  on  April 16, 2025

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    Purchased a new Generac 15.5 Kw generator for our hurricanes. Knowing that Amsoil is the pioneer of API rated synthetic motor oil, it was a no-brainer to go with their Break-In Oil to start protecting my valuable asset from the start. I plan on moving to the Amsoil Small Engine Oil after the break-in time has been met per Generac specs. Looking forward to a long reliable enginge life to support my emergency needs if required.
    Bottom Line

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

    YES (2) NO (0)

• Highlights

  • Quickly seats piston rings
  • Increased zinc and phosphorus protect against wear
  • Maximizes compression and power
• 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

  Friction-modifier-free formula helps rings seat properly for maximum compression and reduced blow-by. Excellent film strength and proprietary anti-wear additive package help ensure cams and bearings are protected during break-in. Delivers competition-quality engine preparation.

  See the product data sheet for full details.

  QUICKLY SEATS RINGS

  • Friction-modifier-free formula allows sharp peaks on newly honed cylinder walls to partially flatten, creating more surface area for rings to seat.
  • Forms a dynamic seal that increases compression, horsepower and torque.

  ---

  PROTECTS CRITICAL PARTS FROM WEAR

  • Contains high levels of zinc and phosphorus (ZDDP) additives.
  • Delivers excellent protection for splash-lubricated parts, like camshafts and lifters, during break-in.
  • Increased film strength protects rod and main bearings from wear.

   

  See the product data sheet for full details.

• Technical Specifications
  Data Bulletin

  Data Bulletins

  SDS

  SDS

  SDS (French)

  
  
  
• Product Reviews
  5 star rating

  Based on 77 reviews

  Based on 77 reviews

  See all customer reviews

  Sort by

  Most Recent Most Helpful Highest Rating Lowest Rating Oldest

  • 4 star rating
    User
    By  TYLER,  a  Verified Buyer  on  May 11, 2026

    Open report issue form

    Describe the issue

    Cancel Submit
    We have been using this oil for 3 years in a 7.90 jr dragster. It outperforms most name brand oils in Friction, heat brake down, and fuel contamination (alcohol) The only thing I noticed with this purchase was the color of the oil was a little darker out of the container, normally it's a bright red like transmission fluid. Not sure if there was a change in formula or there was a slight more zinc added by miss calibrated mixture?
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Great break-in pil
    By  JAMES,  a  Verified Buyer  on  May 09, 2026

    Open report issue form

    Describe the issue

    Cancel Submit
    All of the products were great, but I didn’t receive any gloves or funnels with my purchase.
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Just what the engine ordered
    By  DANA,  a  Verified Buyer  from  Kelowna  on  January 20, 2026

    Open report issue form

    Describe the issue

    Cancel Submit
    I recommend this to all my customers for break-in before going to the T4 !!
    Bottom Line

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

    YES (1) NO (0)
  • 5 star rating
    Big dollar builds
    By  JEFF,  a  Verified Buyer  from  Indiana   on  November 30, 2025

    Open report issue form

    Describe the issue

    Cancel Submit
    Why would you want to use any other product on your investment?
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Break in oil
    By  JAMES,  a  Verified Buyer  on  November 14, 2025

    Open report issue form

    Describe the issue

    Cancel Submit
    Great for junior dragster motors
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    Don’t hesitate to buy it worth every penny
    By  Gio,  a  Verified Buyer  on  August 04, 2025

    Open report issue form

    Describe the issue

    Cancel Submit
    Good quality oil
    Bottom Line

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

    YES (0) NO (0)
  • 5 star rating
    The proper oil!
    By  ROD,  a  Verified Buyer  from  Washington  on  July 02, 2025

    Open report issue form

    Describe the issue

    Cancel Submit
    I build custom street engines and racing engines. I've been using Break in oil in every engine for years. It has the proper additive package for flat tappet cam break in, plus limited friction modifiers to aid ring seating. Even in 900+hp sprint car engines we can see the EGT's change as the rings seat! GREAT product!
    Bottom Line

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

    YES (4) NO (0)
  • 5 star rating
    Great for newly rebuilt engine start up and break in.
    By  WAYNE,  a  Verified Buyer  from  Pennsylvania  on  July 01, 2025

    Open report issue form

    Describe the issue

    Cancel Submit
    I have used this for break in of several rebuilt engines. I never had a problem with flat tappet camshaft break in or ring seating.
    Bottom Line

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

    YES (3) NO (0)
  • 5 star rating
    wesome Break-in Oil
    By  DANIELE,  a  Verified Buyer  from  Windsor, Ontario, Canada  on  June 30, 2025

    Open report issue form

    Describe the issue

    Cancel Submit
    I have used this before a couple times and I would not use anything else as this has bee one of the best break-in oils I have ever used. I have just put together a SBC 383 stoker and I am about to put it on my engine start up stand to run it. I wish I could put a video of it on this review. Please Amsoil you should let us be able to put videos/pictures to our reviews to show what we are doing. Thank you for the best oil products out there.
    Bottom Line

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

    YES (2) NO (0)
  • 5 star rating
    Highly Trusted Brand
    By  DDM,  a  Verified Buyer  from  Cocoa, Florida  on  April 16, 2025

    Open report issue form

    Describe the issue

    Cancel Submit
    Purchased a new Generac 15.5 Kw generator for our hurricanes. Knowing that Amsoil is the pioneer of API rated synthetic motor oil, it was a no-brainer to go with their Break-In Oil to start protecting my valuable asset from the start. I plan on moving to the Amsoil Small Engine Oil after the break-in time has been met per Generac specs. Looking forward to a long reliable enginge life to support my emergency needs if required.
    Bottom Line

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

    YES (2) NO (0)