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.
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 or two-stroke engines.
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
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.
I have been using this is my 1/2 ton farm truck and wife's 16 Tahoe. It really cleans and have noticed it neutralizing the fuel. My fuel trims and changed and a big notice in my alcohol content is way better. I have also noticed we do not have to complete intake cleanings near as often. Helping with carbon build up. We have noticed a slightly better fuel milage. This has slowed the demand for "fuel tank evap as well". Again, THANK YOU AMSOIL.
By 
PG, 
a 
Verified Buyer 
from 
San Antonio 
on 
January 26, 2025
I've used PI for almost a decade now and as far as I'm concerned, its one of the best products AMSOIL makes. While I use it with my cars - and if you start using it early in a car's life, it's going to help keep it from having fuel injector problems - I also use it with small engines. I have a 30AMP generator that wouldn't start at all. I had used fuel with ethanol in it before I became aware that could cause issues. After multiple attempts to start the thing, including using Power Foam in the carburetor, no dice. I figured I'd have to take it to a shop for repairs, but I decided to put in PI with some ethanol free gas and amazingly, that generator cranked up. Shut it off and started it again the next day, no problems starting. Put a half bottle of PI in there with non-ethanol gas and it ran until it was out of fuel.
That was 7 years ago, and that generator hasn't given me an ounce of problems starting/running since, including during the Texas deep freeze of 2021 when we lost power for 3 days in sub-20 degree weather. It ran for ~ 55 hours pretty much nonstop. Not going to say PI is magic or a cure for bad maintenance/operation but it worked for me.
Bottom Line
Yes, I would recommend this to a friend.
Was this review helpful?
5 star rating
Great Product
By 
DION, 
a 
Verified Buyer 
on 
January 21, 2025
Great product running it in all of my vehicles. Noticed a big difference in the performance of my vehicles. Used to use a different product, now I'm team Amsoil for sure.
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