Back

Close Icon

Main Menu

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
    Most effective fuel system cleaner I've used
    By  JAIME,  a  Verified Buyer  on  April 09, 2021

    Describe the issue

    Read reviews online and publications from Amsoil, but after searching various forums where I knew information would be as unbiased as possible I decided to try this. I used it in three different vehicles, 2001 Land Rover Discovery (4.0 V8 160K), 2008 Chevy Tahoe (5.3 V8 157K) and 2015 (3.5 V6 40K) Jeep Wrangler. Each had different results. The Land Rover immediately idled smoother. It is a torquey but low HP motor so performance seemed about the same. Nonetheless, definitely smoother across the board. The Tahoe had been idling a bit rough prior to use and everything had been cleaned up as much as possible following a head removal for lifter fix recently. I suspected injectors since I knew there were no other vacuum leaks or issues. This truck was the one that triggered the search for injector cleaners to see what the market looked like. By the end of the tankful it idled almost like it did when I first got it and it got REALLY quiet when at idle. Mid to upper RPM full throttle pulls felt MUCH stronger. 3500-5000 RPM it pulls hard now. I forgot how strong this engine was. Smooth since then two tankfuls ago. The Jeep didn't change much. It had been running mostly fine, but it was the one of the three that I noticed white smoke from much like a direct injection of cleaner through an intake. Despite being the lowest mileage of the group it gets the most city driving and start and stop as well as slightly longer oil change intervals. I suspect it built up a relatively high amount of carbon for age. I've tried products in other vehicles and this appears to be the only one where I've noticed differences beyond the placebo effect. Like most Amsoil products it is not "cheap" but whatever cleaners they put in this it is VERY concentrated. Injector cleaning and carbon removal seem substantial. I wish I would have put a borescope in the cylinders just to see what it did exactly. I would recommend.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Performance Improver
    By  JAMES,  a  Verified Buyer  from  Virginia  on  April 04, 2021

    Describe the issue

    Use at every oil change. Cleans injectors. Engine runs smooth. You can tell if you do not use it. Better mpg. It just works plain and simple.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Works As Advertised
    By  BWS,  a  Verified Buyer  from  IA  on  April 02, 2021

    Describe the issue

    My car seems to have more power when I'm running this in the fuel and I never have fuel related problems with injectors.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Excellent product
    By  Bill,  a  Verified Buyer  from  Gardner, MA  on  April 01, 2021

    Describe the issue

    I use every 5,000 miles. Helps keep my old jalopy run like new.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Excellent fuel treatment.
    By  MARK,  a  Verified Buyer  on  April 01, 2021

    Describe the issue

    Every time I buy an oil change, I always buy fuel treatment. Works well.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Great for GDI engine
    By  ALEX,  a  Verified Buyer  from  Innisfail Alberta, Canada  on  March 31, 2021

    Describe the issue

    Amsoil oil filters have kept our 2 Hyundai engines in excellent shape. They are part of the Amsoil oil change that includes Signature 5W20 oil, upper cylinder treatment, and PI fuel treatment. Bought since new, the cars (Sonata 2013; Elantra 2014) perform very well and we plan to keep them as long as possible. Amsoil products and the Amsoil team are offering the best products. They are trustworthy and stand behind their products 100%.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    Smoothed Out Idle
    By  NEIL,  a  Verified Buyer  from  Chicago   on  March 30, 2021

    Describe the issue

    Works wonders I tell you. My 2013 Toyota Highlander with 70k tends to idle rough and this fixes that issue. Seems to be doing it’s job at cleaning the cheap Costco gas that I use.
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    By  COLLIN,  a  Verified Buyer  from  Georgia  on  March 30, 2021

    Describe the issue

    Actually works well, I used to get 29 highway, now I get 32 with the combination of everything. Stuff works wonders
    Bottom Line
    Yes, I would recommend this to a friend.
  • 4
    best gas additive
    By  Jorge,  a  Verified Buyer  from  New Jersey  on  March 28, 2021

    Describe the issue

    keeps my engine running like a champ and the gas mileage is great
    Bottom Line
    Yes, I would recommend this to a friend.
  • 5
    PI!!!! Love it.
    By  DARIN,  a  Verified Buyer  from  Northfield, Minn  on  March 28, 2021

    Describe the issue

    Love this stuff. Use it in all my vehicles, I run non-oxy fuels all the time and still feel and see the improvements. Love Amsoil! The others are not worth it.
    Bottom Line
    Yes, I would recommend this to a friend.