Customer Ratings & Reviews

Le moteur tourne mieux plus égale aussi à reprendre à la prochaine commande pour tous mes véhicules

I've tried several fuel system cleaner products in the past, but never noticed any changes. But the AMSOIL P.I. Improver actually works! I use it in all my vehicles, 2021 GMC Yukon Denali, 2018 Jeep JL Wrangler Rubicon, and 2015 F150 w/5.0 Coyote Engine. I first put it in my son's truck shortly after we purchased it with 148,000 miles to clean up all the years of gunk. Poured a bottle in before filling up a tank of gas just before a long highway trip that ran it down to empty. We noticed a bump in horsepower as well as a bump in MPG. This is part of our regular maintenance in all our vehicles, every 4,000 miles, in trying to get our vehicles running better than new.

I bought a used 2021 Subaru Ascent with 70,000 miles. I decided to switch over to AMSOIL products to improve and prolong the life of my car. I'm so glad I did. I was only getting like 17 miles/gallon before I switched to this AMSOIL product. I have now ran two bottles of the AMSOIL Performance Improver Gasoline Additive through the fuel system. Last week I went on a road trip visitibg different lakes in West Virginia. 1/2 the time I was on back roads which were hilly and curvy and the other half was interstate driving. I was actually shocked to see my MPG jump from 17 to 26.5 The next time I place an order I will be sure to get a few bottles of AMSOIL Performance Improver Gasoline Additive. I highly recommend all AMSOIL products. I've also switched to AMSOIL motor oil and CVT transmission fluid and my Subaru thanks me for it! Thank you AMSOIL!

Put two of these in a 36 gal tank at fill up after an oil and air filter change. Saw about an 0.5 to 1 gal increase in gas mileage. I think it helped with a rough idle issue that has since not come back after 1,000 miles.

Used for the first time. My vehicle has 180,000 miles and I have used fuel additives periodically but never felt like I saw any benefit. I really got this to get me to the level of free shipping. No change on the tank I ran it through but a .8 MPG increase on the next tank. Both tanks were run over the same highway route within days. I am sold will definitely be getting a bottle with every oil change.

Wouldn’t change for anything

Excellent product as always

I use this product once a year on my gmc canyon.

Definitely seen a better acceleration response and did notice my gas lasting longer than usual

Help with the idle of my old car

I believe this is my second purchase of this product. I can tell the difference with my acceleration especially when I'm having to pass another vehicle to get around them. It's been a little difficult trying to see if I'm gaining any kind of mileage per gallon of gas because I can't help feeling that acceleration my engine just runs so much smoother I haven't really noticed any any knocking when I start it being at a Dodge Ram 1500 Sport pickup Rams notorious for knocking. I will be sure to use this every 4,000 miles. Thank you Amsoil for another great product.

Put this in my new truck regularly Just to keep it like new inside my fuel injection system I have used this for years without any problems great product

My car runs like it's brand new best product.I ever had I will only use Ams oil products

Offer a deep clean !

This is a great product! I can tell it improves gas milage when I use it! I use it when I go on long trips! Definately worth the money!

I used this product and i notcied a difference after one tank full. I will be buying again.

Good product. I use it regularly.

I am driving 273000 mileage Toyota Camry 2005. I used it on 272568. After 25miles of driving now I suddenly feel, there is something happened. Car responses are way far better than a minute ago. Really very appreciative. Amsoil is not available here. No shop sell their products, so additional $10 shipping makes it expensive where the product price is $18. I recommend to buy, but only when it is near around you.

They did a study in Japan on taxi card and wanted to know how they were getting 300,000 + miles out of there engines. It turns out they were adding something similar to Amsoil PI to the tank every 6000 miles which happened quit frequently due to being taxi cabs. So every 4000 miles is reasonable to me. I have only used this once and then bought a case. In my 2025 Subaru 2 4 liter horizontaly opposed turbo boxer I noticed an immediate improvement in torque and smoother running and acceleration. Again cheap insurance dirty injectors cause nightmares.

Absolutely the best top tier fuel additive that actually works. Smooth out rought idle,cleared my rich running check engine light. I don't feel my truck idling at stops. Worth the buy.