Product Reviewed: P.I Performance Improver (API)
Current Rating: 4.91 out of 5 stars
Votes & Reviews: 371 vote(s) and 230 user reviews.
Reviewed by lotoofla: 
Living in Washington State, I don't ride my 2014 BMW R1200RT-LC year round so I leave it in the garage hooked up to a Battery Tender, and the gas tank filled with Pure Gas AND 3 oz. of Amsoil's Gasoline Stabilizer. Every summer when I start up my bike there is little hesitation, and the engine settles down to a steady idle. Riding that first tank shows no problems or misses in any RPM range, though I don't get the full mileage of 300 miles, but with the very next tank of gas things are back to normal.
Reviewed by Mx:
Great stuff for dirtbike
Reviewed by Cal:
I like this product!
Reviewed by AlYaz:
I trust Amsoil products, after using them for so many years. Our gasoline gets delivered by barge and then trucked to us. It's always got visible crud in it and I have to put it through a filter first. As soon as I get my gasoline, I filter it and add Amsoil Gasoline Stabilizer. While others in the area have had numerous problems with 'bad gas,' my gasoline has never let me down. It gets used in my Stihl saws, Echo yard equipment, my Polaris Ranger, my portable Honda generator, my Ariens wood splitter, etc. Never a problem.
Reviewed by Subwaync:
I drive a BMW and the last thing I want is a problem with the Fuel System. SO add this fuel additive to a Tank every so often and troubles stay away
Reviewed by n/a:
excellent product
Reviewed by Cal:
I like this product!
Reviewed by EG:
I recommend AMSOIL p.I. cleaner to anyone to clean the engine combustion chamber and fuel injectors or carburetor of a gasoline engine. I've used this exact product on a recommended vehicle maintenance schedule for many years. There is a very noticeable difference to prevent engine from knocking by cleaning the carbon from the combustion chamber. I use this in a Ford truck, Pontiac car and a Kawasaki motorcycle. Highly recommended above any product of its kind is AMSOIL p.I.
Reviewed by IronHeadChef:
Before I started using this product (P.I.) my 2006 Toyota Tacome was getting about 19 - 20 MPG. When I use this product it moves easily to 20-22 MPH. It must be doing something good. However, I must admit to using exclusively Amsoil Signature oil.
Reviewed by EG:
I recommend AMSOIL p.I. cleaner to anyone to clean the engine combustion chamber and fuel injectors or carburetor of a gasoline engine. I've used this exact product on a recommended vehicle maintenance schedule for many years. There is a very noticeable difference to prevent engine from knocking by cleaning the carbon from the combustion chamber. I use this in a Ford truck, Pontiac car and a Kawasaki motorcycle. Highly recommended above any product of its kind is AMSOIL p.I.
Reviewed by IronHeadChef:
Before I started using this product (P.I.) my 2006 Toyota Tacome was getting about 19 - 20 MPG. When I use this product it moves easily to 20-22 MPH. It must be doing something good. However, I must admit to using exclusively Amsoil Signature oil.
Reviewed by Papa Smurf:
I use a bottle of this every time I change my oil. So far at 240,000km (145,000m) no injector problems.......
Reviewed by Papa Smurf:
I use a bottle of this every time I change my oil. So far at 240,000km (145,000m) no injector problems.......
Reviewed by mikey:
I use this every time i tow my camper.
Reviewed by
JWFARMER:
I put the product in my 2007 Chevrolet Tahoe with 140,000 miles. I did not notice a difference at all. I have used multiple Amsoil products but ill probably never use this one again.
Reviewed by Jag Fan:
I have a1970 and 1974 E Type Jaguars which were built to run on leaded 98 Octane fuel. Since researching various Octane boosting products and finding this Amsoil product I buy it by the case and use a bottle every time I fill up the tanks in my cars and they have never run better! Love this product. Improved the gas mileage as well which was an added bonus.
Reviewed by Rerapper:
This product is super for all gasoline engines!
I use in all my vehicles plus my outboard engine. They purr along with this product without any hiccups or pauses
Reviewed by
Brunelle Luc:
I used the Improver in my 2000 2.0L VW and also with my Yamaha outboard 100hp 4 stroke. They both have high mileage and religiously maintened. The P.I. did remove blue smoke happening occasionly at starting and gived both engine a extremely smooth idle and better throtle response.
Excellent product to use helping engines like new again!
Luc Damexco racing,
Reviewed by Duke:
Use it in my boat , from season to season , never had a fuel problem after a winter storage ..
Reviewed by BR:
I keep my vehicle serviced on schedule, and use Marvel Mystery Oil in the fuel, for lubrication of injectors. Even with this good maintenance, I notice my engine runs better after using Amsoil's P.I.
I use the P.I. twice a year. My vehicle has over 240,000 miles on it and runs almost like new. It also passes smog tests with low emissions. I believe a strong fuel system cleaner and combustion chamber cleaner is needed for all engines, periodically. Amsoil P.I. is top quality, and is not harmful to the engine, like some strong solvents may be. P.I. is made of special oils and detergents, which are engineered to be safe and effective. I completely trust Amsoil for this product.
Reviewed by Bassman:
Everybodyshould get this product because it is great with gas and gas mileage.
Thanks I amsoil
Reviewed by Marc:
I have been using Amsoil PI in my truck, Atv and my Harley. I have been putting it in my truck since it was brand new. I have 45,000 miles on it now and i have not seen any difference in fuel mileage and with throttle response. The PI is keeping the fuel system clean. I get the same outcome with my Atv and harley even when they sit for several months.
Reviewed by TCG:
Excellent worth every cent.
Reviewed by Josh:
I love that it's no bs marketing just a product that does as claimed. I ran many product through various older vehicles I've owned and amsoil is a superior product.
Reviewed by POINTLES11:
I NOTES MY GAS MIL DROP FAST WENT FROM 24 DOWN TO 18 IN A 1 MONTH TIME FRAME. I WAS TOLD ABOUT THE AMSOIL P.I. PERFORMANCE. SO I FOUND SOME, I GOT 2 BOTTLES AND USED THEM BOTH BECAUSE I HAVE A 22 GAL GAS TANK. IN ONE TANK OF GAS I NOTES MY MIL WET UP TO 26 MIL PER GAL, AND I USE IT EVERY 5000 MIL. I AM STILL AT 26 MIL PER GAL. I BEN USEING NOW ALL MOST 2 YEARS THIS IS THE BEST STUFF OUT THERE.
Reviewed by Slik:
I used this product in my wife's car and noticed that the mileage increased along with a smoother running engine. My daughter was having an issue with her car stalling once she got below a half a tank of gas. I believe that it was a dirty filter and pickup in the tank. After running a bottle through her car, it cured the problem and made her car run better than it had since she had bought it two years earlier. Great product!
Reviewed by Bill:
I've used other injector/fuel system cleaners for years. I discovered Amsoil's gas additive a couple years back. I use it every 4,000 miles like the directions state, and it keeps my 1995 Ranger with 160,000 miles running like new.
Reviewed by Outdoors man:
Use this on my friends car and it inproved the gas mileage by 3 percent.
Reviewed by Nancy:
My car was idling rough, and when I took off from a light it didn't seem to have the power it once had. I went to the garage and he recommended a tuneup.
A friend sells AMSOIL and he said to try the Pi.Improver, so for the cost I figured I would give it a try before going in for the tuneup. One bottle in the tank when I filled up and in about 3 days I noticed it wasn't idling rough anymore. OMG, this stuff works, I now have my car running like new, Thanks!
Canada
United States
gasoline stabilier
I use this product in my gas for my small engine equipment around the farm, it works very well in stablizing the gas and i thinks heips the equipment run better as well.