☰
Shop by Vehicle
Find AMSOIL Near You
Open full size image product P.i. Performance Improver Gasoline Additive
Roll over image to zoom in
Roll over image to zoom in

P.i. Performance Improver Gasoline Additive

Product code : APICN-EA

4.9 star rating
Read 695 reviews
Read 695 reviews

  • Restores up to 14% horsepower1
  • Restores GDI fuel injectors to 100% flow rate after one tank of fuel2
  • Improves fuel economy
  • Reduces need for costly higher-octane fuel
  • Helps prevent carbon rap
  • Controls pre-ignition knock
  • Compatible with capless fuel systems

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.

Warning - Click here for Proposition 65 information for this product
Product Overview

P.i. Performance Improver Gasoline Additive



AMSOIL P.i. is a potent gasoline performance improver with concentrated detergent that aggressively cleans stubborn, power-robbing deposits from injectors, valves and the combustion chamber. Effective in port and direct injection systems. Bottle compatible with capless fuel systems. Cleans entire fuel system in one tank of gasoline. For use with cars and trucks. Treats up to 30 gallons. Add entire bottle to tank at fill-up. For best results, clean your fuel system with P.i. every 4,000 miles (6,400 km). Do not use with diesel, E85 or 2-stroke mixed fuel.

See the Product Data Bulletin for full details.

MAXIMUM DEPOSIT CLEAN-UP

  • Helps keep valves clean and moving freely.
  • Aggressive additives attack the most common forms of engine deposits and limit their effects.

REMOVES FUEL-INJECTOR DEPOSITS

  • P.i. removes deposits and keeps injectors functioning as they should.
  • Testing shows P.i. restored GDI fuel injectors to a 100% flow rate after one tank of fuel.2

RESTORES HORSEPOWER

  • Third-party testing demonstrated performance of P.i. using a 2016 Chevrolet* Silverado* with 100,616 miles on the odometer.
  • Following a single treatment with P.i., the truck measured an incredible 14% improvement in horsepower.1

Horsepower Comparison

CLEANS COMBUSTION CHAMBER DEPOSITS

  • Fights combustion chamber deposits to help restore power, control knock, increase fuel economy and reduce the need for higher-octane fuels.
  • Protects against compression loss, difficulty starting and rough idling.
  • Reduces possibility of "carbon rap," when deposit buildup causes the piston to hit the cylinder head.
  • Decreases the possibility of pre-ignition "knock" or "pinging."

CAPLESS-COMPATIBLE BOTTLE

  • Bottle is fully compatible with capless fuel systems.
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.

Technical Specification

P.i. Performance Improver Gasoline Additive

Warranty

Data Bulletin

SDS



Product Reviews

P.i. Performance Improver Gasoline Additive

4.9 star rating
Based on 695 reviews
Based on 695 reviews
See all customer reviews
  • 5 star rating
    Great product
    By  GARY,  a  Verified Buyer  from  Iowa  on  November 29, 2023
    I noticed an increase in gas mileage and a better response when I stepped on the gas right away. This product does what it says it will do.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    It Works
    By  BRIAN,  a  Verified Buyer  from  Charlotte   on  November 27, 2023
    Hello, recently purchased some Amsoil PI performance improver and I'm very happy with the results of this product. I feel that it did a very good job in cleaning the fuel system and taking out any contaminants that were remaining in there. I noticed acceleration was better overall and very smooth shifting. I like how it is engineered to be used every 4,000 miles so it's not something you need to worry about putting in your tank every time you fill up. I would not hesitate to purchase this product again I feel it's a good buy and a good value.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    A good clean up!
    By  MICHAEL,  a  Verified Buyer  from  Quebec Canada  on  November 13, 2023
    nettoie en profondeur
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    A good clean up!
    By  MICHAEL,  a  Verified Buyer  from  Quebec Canada  on  November 13, 2023
    effectue un excellent nettoyage des injecteurs
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Works great
    By  BRIAN,  a  Verified Buyer  from  Utah  on  November 10, 2023
    Cleans very well and last a long time
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    PI
    By  RUSSELL,  a  Verified Buyer  on  November 08, 2023
    Worked great, up'd my mileage about 2.4 GPM
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Awesome
    By  RYAN,  a  Verified Buyer  on  November 06, 2023
    This product improved my gas mileage by at least 2-3mpg in my Tacoma on the interstate. It seems to last fir several months too.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Great product
    By  TIM,  a  Verified Buyer  on  November 06, 2023
    I do notice a few MPG difference when using this regularly. Minimal investment for keeping your fuel system clean and running in good order. Great product.
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Top notch
    By  BRETT,  a  Verified Buyer  from  South carolina  on  November 05, 2023
    Had a little hesitation in my wife’s van, put this stuff in it and it cleaned it right up. Picked up a few miles a gallon also. It will pay for it self
    Bottom Line
    Yes, I would recommend this to a friend.
    Was this review helpful?
  • 5 star rating
    Smoother idling
    By  JESSE,  a  Verified Buyer  from  CA  on  November 05, 2023
    My car was idling a little rough, after a tank of gas with PI it is idling smooth again.
    Was this review helpful?