Customer Ratings & Reviews

I run this product every 4 to 5 thousand miles, it helps optimize my MPG and keeps my emission equipment happy.

Ron and 2019 mustang GT every 4000 miles keeps it running at its best good stuff

I can not positively say that this has improved my octane rating, however the studies have shown that it will. I do believe it will not harm your engine, it could only improve the quality of fuel you use. I just can’t say if it “improved” my gasoline consumption. I do believe the detergents would help keep fuel cleaner.

Tremendous product. Keeps fuel systems clean and contributes to increased MPG. Engine idle is always smooth and no hesitation on acceleration.

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.

After using this product on multiple occasions and in several vehicles, I did not notice any significant improvement in performance or fuel economy

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.

Best additive ive ever used. Can actually feel the difference in performance

interested to see if this additive can partially remove carbon deposit on piston crown. Backup generators operating at reduced wattage for lengthy periods can be susceptible to this issue. Monitoring with inspection camera after operating at near full power.

nettoie en profondeur

effectue un excellent nettoyage des injecteurs

Cleans very well and last a long time

Worked great, up'd my mileage about 2.4 GPM

Vue la différence wow

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.

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.

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

My car was idling a little rough, after a tank of gas with PI it is idling smooth again.

I've been using only Amsoil products since 2000 because they are the best.

I say it all the time... I trust in the testing on Amsoil products and against Amsoil products that Amsoil almost comes out ahead of the rest in almost every category of testing. So, I'll be using Amsoil as long as I'm alive...