Customer Ratings & Reviews

I use amsoil because it's the best oil money can buy.

I have carefully monitored my mileage before and after using this product. I always get 4 - 5% better mileage on a tank of fuel treated with P.I. Performance Improver. I treat my vehicles with it twice a year. Once in the spring, and once in the fall. I have never had a fuel injector problem.

I use the AmsOil PI on a regular basis in my 2014 RAM, Hemi. Excellent product, keeps the engine running great / clean, 22 mpg on the highway.

Put it like this efficient and reliable. Better than oem performance.

Use both the PI and the amsoil synthetic oil and filters (signature series) Taurus SHO 2010. Car runs smoother and better gas milage ...tested both before and after .... Will never buy another brand again!

Car runs smoother with a fuel increase of 2 mpg.

I use this ed very 4 months and definitely before a smog check up. When I get my cars tested they are way better than average and usually the technician' s are scratching their heads when I leave. It definitely cleans your fuel system you have to give it a try. I also get better gas mileage.

My 03 Tundra with 190k mi ran noticeably smoother within 50 miles of adding this.

I use this product in both of my vehicles once a month, great product

I used this in one of my older high mileage cars and it seemed to really do what it was intended. I will use this again and probably even in the newer ones.

Been using for years. Keeps moisture out and clean injectors

Great product

Seem work good additive pi performance gasoline additive with 93 fuel noticed much more effective clean more deep work as great

Used this product many times at every oil change all but good results.

I use this product every time that I change the oil on my vehicles. I drive about 1000 miles per week so I change my oil frequently. It does what it says that it does. i wish it were already added to the gas at the pumps. My vehicles run as smooth as silk.

I just completed my second try of P.I. I didn't notice any change during or after my first tank and waited for another oil change before trying it again. On the second use I did notice a change in mileage and the engine did seem to run smoother. I will continue to use as directed.

I use PI gas sedative in all 3 of my vehicles plus lawn mower and snow blower helps keep carbon down.

Best product ever thanks

I have been using amsoil now for about 8 months in my cars and motorcycles and I love it works very very well and it is a high quality product

I have used the P.I.Performance in several cars and trucks of all ages. P.I. will help keep the fuel system clean and increase Horse Power and Mileage I have recommended this product to friends and relatives and they have all agreed its a great product and will continue to use it..