Back

Close Icon

Main Menu

Your order may take longer than normal to arrive. We are experiencing extremely high demand and freight carriers are experiencing delays nationwide. LTL shipments are most severely affected.

P.i. Performance Improver Gasoline Additive

Product code : APICN-EA

Restores up to 14% horsepower1
Reduces need for costly higher-octane fuel
Reduces noise from carbon rap and pre-ignition
Controls pre-ignition "knock"
1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary.

Restores up to 14% horsepower1
Reduces need for costly higher-octane fuel
Reduces noise from carbon rap and pre-ignition
Controls pre-ignition "knock"
1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary.

Warning - Click here for Proposition 65 information for this product

P.i. Performance Improver Gasoline Additive



Concentrated detergent aggressively cleans stubborn, power-robbing deposits from injectors, valves and the combustion chamber. Reduces emissions. Effective in port and direct injection systems. Bottle compatible with capless fuel systems. Cleans entire fuel system in one tank of gasoline.

See the Product Data Bulletin for full details.

REMOVES STUBBORN DEPOSITS TO RESTORE POWER AND PERFORMANCE

  • AMSOIL P.i. restores up to 14% horsepower in one tank of gasoline.1
Horsepower Comparison
  • Fights intake valve and combustion chamber deposits which helps restore power, control knock and reduce the need for higher-octane fuels.
  • Restores GDI fuel injectors up to a 100 percent flow rate.2

1Based on third-party testing in a 2016 Chevrolet* Silverado* 1500, 5.3L V-8 GDI with 100,616 miles, using one tank treated with AMSOIL P.i. Actual results may vary.
2ASTM D5598(M) – 2013 Buick Regal test vehicle.

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.

P.i. Performance Improver Gasoline Additive

G2543: A Study in Performance
Download the G2543: A Study in Performance


P.i. Performance Improver Gasoline Additive

  • 5
    Gas Additive a plus
    By  JW,  a  Verified Buyer  from  Post, Texas  on  October 19, 2021

    Describe the issue

    I run the gasoline additive approximately every 90-100 days in both my wife's 2020 Ford Explorer, and in my old '95 Ford F-150. never any problems with either vehicle. Especially seems to keep my old truck running well.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Pi improver
    By  STEPHEN,  a  Verified Buyer  from  Bakersfield   on  October 18, 2021

    Describe the issue

    I have a new 2020 4 runner 27000 miles don’t know if it works or not just playing it safe with the fuel now a days I use it every 5th tank of gas.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Initial results are positive
    By  Jim,  a  Verified Buyer  from  California  on  October 13, 2021

    Describe the issue

    I’ve use P.i. Performance Improver for first treatment in two vehicles, both with original internals, injectors, etc. 1995 Tacoma (2.7 L) with over 300K miles, and 1998 Wrangler (4.0 L) with over 150K miles. Both have smoother idle, enough performance improvement to notice, and gained an extra mile per gallon. Will continue use at recommended interval.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Keeps things clean
    By  SAMUEL,  a  Verified Buyer  from  Nyc  on  October 09, 2021

    Describe the issue

    Use it every oil change
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Quality Fuel Additive!🤙
    By  JH,  a  Verified Buyer  from  VA  on  October 05, 2021

    Describe the issue

    I add it to my older vehicles with every oil change. Works a good as you can expect. Being another Amsoil product I trust it.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Great Stuff
    By  RYAN,  a  Verified Buyer  from  North Carolina   on  October 05, 2021

    Describe the issue

    Definitely could tell a huge difference after running it through a full tank of gas on my 1988 k1500 with 227,000 on the dash. After I used it all through one full tank I had better throttle response, engine idle, and all around performance. Definitely going to use it every oil change for piece of mind.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    All vehicles
    By  Danny,  a  Verified Buyer  from  Florida  on  October 01, 2021

    Describe the issue

    I use this in all my vehicles always keep the fuel systems clean.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Great product
    By  DANIEL,  a  Verified Buyer  from  Tx  on  September 30, 2021

    Describe the issue

    Definitely a noticeable preforms boost with better gas mileage as well
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    really good!!!
    By  michael,  a  Verified Buyer  from  Oklahoma  on  September 29, 2021

    Describe the issue

    i use this every other oil change to ensure my engine is at its best
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5
    Noticed it within 5 minutes
    By  MICHAEL,  a  Verified Buyer  from  Oshawa   on  September 26, 2021

    Describe the issue

    I added this after engine flush and oil change. I could feel the difference right away. I highly recommend this product
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?