Customer Ratings & Reviews

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...

This is a great product, the long drain interval is awesome! I’ve been using amsoil stuff for over 20 years, and I couldn’t be happier! Thanks for great products!

I have only used this product 1 time so far. I did not notice much of a difference at first but by time I had used 1/2 tank of fuel I noticed my vehicle more responsive when I stepped on the accelerator and by time I had burnt 3/4 tank of fuel my mileage become notibily improved

Run this in all of the vehicles. Never had any issues.

I used PI for the first time after an oil/filter change at 107k. I was amazed that I actually could feel the power and the fact that my gas mileage increased by 10%. This stuff really works.!!!

I have used this additive since Jan. 2015… Clean smooth performance, and improved optimal mpg😊👍