Customer Ratings & Reviews

I use this all thru the year in my colorado and wife's equinox.We actually see an improvement in gas mileage and performance!

Grateful lubricating all your engine parts and fuel line and stuff like that

This product is really great at cleaning out my fuel system. IT improves performance and mileage better than any other product I have used.

I have been purchasing the Performance Improver Gasoline Additive and Upper Cylinder Lubricant Additive since last year. The ordering process is simple, shipping is rather fast and most importantly the products work. I have noticed improved fuel mileage and a smooth running engine. Amsoil offers many other quality products as well. I do not have any other needs at this time because of warranty service provided on my car.

I use Amsoil oil in everything i own i used this additive in my 99 ram with the 5.9 gas engine and it did seam to improve the engines mileage

You can notice the inprovement

Never noticed 1 iota of difference in the running of our Colorado.

This product it totally outstanding.

Great product , I use it in both of my Infinity’s & my Harley Davidson motorcycle ! Makes a big difference in Performance ! Buy it

Improved throttle response and M.P.G.

I have been using AMS oil for years, it's the best. I started using in my Race Car first then in my truck and my whole family is using it now in there cars, I also like the articles in the booklet very informative Thank you guys

Lots more power and better fuel economy.

First time use on both the GTi and the CX-9, with upper cylinder it certainly helped workout some sluggishness and the cars need it in this cold short trip weather!

It work in my Toyota tundra 2008 I saw efficiency in mileage I recomend this product

I have been using this additive for several years and am a fan. Just like with my MC, I noticed our HEMIs ran a little rough at times, since we moved to SC. Professional techs explained the issues we were having was most likely due to the poor fuel quality in this area. I use one bottle at every oil change. And one between 3 and 4K miles. I haven’t had the hesitation issue, since I started using this additive.

Increased mileage by a couple mpg.

Started using this product every 5K. I don’t know if it’s my head, but my wife is getting better gas mileage as a result.. the idle also has smoothed out when you come to a stop sign or red light.

Since I have been using Amsoil PI my vehicles have never had a fuel related problem. I only have 2 vehicles now, but I buy a case at a time and give it to other people!

I had a friend who's truck didn't like to start in cold weather, he even tried new plugs and wires to no avail. After using just one treatment he said the problem finally went away great product . Thanks guys

Truck has better mpg..more responsive too