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.

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
    good stuff
    By  david,  a  Verified Buyer  from  NY  on  June 19, 2021

    Describe the issue

    been using this product since 2004. work well and will keep using it
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Best I've every used!!!
    By  Alford,  a  Verified Buyer  from  TX  on  June 14, 2021

    Describe the issue

    I use this every time we make a trip to other states. I only need one for a tank. I got about 44MPG!!! at one point during my trip. I averaged 40Mpg there and back about 850 mile trip one-way. I'm still getting great gas mileage for close to a moth after putting it in one tank. I highly recommend this product!!!
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Performance Improver Gasoline Additve
    By  MARK,  a  Verified Buyer  from  Centennial CO  on  June 14, 2021

    Describe the issue

    This stuff really works. It really cleans the fuel system.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Great Product
    By  DJ,  a  Verified Buyer  on  June 13, 2021

    Describe the issue

    Great product. I’ve used it every 5,000 miles on all my cars over the last 3 years.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Get's the residual gunk out of the fuel system!
    By  NATHANAEL,  a  Verified Buyer  from  New Jersey  on  June 12, 2021

    Describe the issue

    This product helped attribute to fantastic idling and MPG just like the upper cylinder lubricant. I like to put this product in when I change my oil and go on a long road trip. The deep heat cycle of the engine helps clean the carbon deposits in conjunction with P.I. Improver. These products are fantastic and I will continue to buy them.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    diff oil
    By  John,  a  Verified Buyer  from  FL  on  June 09, 2021

    Describe the issue

    excellent product,outperforms gm oil
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Excellence Performance
    By  VICTOR,  a  Verified Buyer  on  May 31, 2021

    Describe the issue

    I would definitely recommend this product. I definitely felt the difference.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    164000 mile Mercury Monterey van
    By  Danny,  a  Verified Buyer  from  Illinois  on  May 22, 2021

    Describe the issue

    See the story in the previous product review.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Great product but...
    By  SETH,  a  Verified Buyer  on  May 22, 2021

    Describe the issue

    Great product but bottle needs better functioning lid. Very difficult to remove
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    i use this a couple times a year
    By  michael,  a  Verified Buyer  from  OK  on  May 22, 2021

    Describe the issue

    this stuff seems to make a difference, and its good to have a product you can trust
    Bottom Line
    Yes, I would recommend this to a friend.