Customer Ratings & Reviews

I noticed my Mazda cx7 had more pep and smoother running after just the first treatment. As a bonus my fuel mileage also increase.

It seems to help and gives me more mpg

Works and provides results. Helped my trucks and many other vehicles I own get better performance and definitely helps clean my fuel system.

Jury is out on whether this product is effective. I add a bottle when I change the oil in our cars each year, and we generally only put about 5-6k miles on our cars each year, so it's close to the recommended 4k miles. Been using this product for about two years and all the cars run well, so that's a good sign.

I have used this product a long time and I feel it works great

I used other fuel additives in the past, but this stuff works better than anticipated.

Works great always use before big trips

I noticed an increase in power while driving up hills. Seems to do a good job.

I drive a bored and stroked Hemi (gaoline powered) Ram truck with 11.0:1 compression. It boils fuel in the rails when idling in warm weather. Good gas is a necessity but hard to find and not cheep. I'm retired and it may take me 2 weeks, or more, to burn a tank full. Amsoil PI seems to work better than Lucas as measured by my throttle experience :] 93 pump gas stays fresh for weeks and throttle response is always crisp and powerful. It "seems" to increase the boiling point of fuel as my soggy throttle response in traffic is not as bad. I put PI in every fill up of both my V8 powered vehicles. It truly is, as the label implies, a performance improver! Amsoil just makes the best stuff period. Thanks Amsoil!

HAVE USED P1 FOR A NUMBER OF YEARS AND IT WORKS VERY WELL TO KEEP CARS RUNNING AT OPTIMUM PERFORMANCE.

I run the gasoline additive approximately every 90-100 days in both my wife's 2020 Ford Explorer, and in my old '95 Ford F-150. never any problems with either vehicle. Especially seems to keep my old truck running well.

I have a new 2020 4 runner 27000 miles don’t know if it works or not just playing it safe with the fuel now a days I use it every 5th tank of gas.

I’ve use P.i. Performance Improver for first treatment in two vehicles, both with original internals, injectors, etc. 1995 Tacoma (2.7 L) with over 300K miles, and 1998 Wrangler (4.0 L) with over 150K miles. Both have smoother idle, enough performance improvement to notice, and gained an extra mile per gallon. Will continue use at recommended interval.

Use it every oil change

I add it to my older vehicles with every oil change. Works a good as you can expect. Being another Amsoil product I trust it.

Definitely could tell a huge difference after running it through a full tank of gas on my 1988 k1500 with 227,000 on the dash. After I used it all through one full tank I had better throttle response, engine idle, and all around performance. Definitely going to use it every oil change for piece of mind.

I use this in all my vehicles always keep the fuel systems clean.

Definitely a noticeable preforms boost with better gas mileage as well

i use this every other oil change to ensure my engine is at its best

This is the first time I'm using this product and I notice in the end of my tail pipes there's a bit of black carbon in my chrome pipes, that means it's cleaning not just my injection it's cleaning my catalytic converter has well. Kia 2021 stinger GT limited 3.3 GDI turbo