Customer Ratings & Reviews

This is the first time I am using this additive, yet it seems to be working okay. My 2005 F-150 has 93K on it and I have babied it since it was new. I would use this product again.

I don't actually think my vehicle needs this cleaner as it's low miles with the best premium fuel I can find. It did help milage during and after use though. I look at it as a maintenance item and I'd rather make it to 100k with factory injectors than replace.

I used the Amsoil gasoline additive in my Escalade and Dodge pickup. It brought the Escalade to life and gave my pickup a newfound boost of power. I use one bottle with each tank of gas. My miles per gallon has increased and gave me a quick needed boost. I would definitely recommend this product. I will be using it also in my Harley next spring.

I tried in two different cars. The Subaru went down two miles per gallon. The equinox made no difference. I check mileage in all my cars every fill up and maintenance is written in the log book.

I used to use Sea Foam and then decided to try the Amsoil additive. My GMC Sierra 1500 truck (over 175,000) idled better and ran smoother. Then when the check engine light came on a couple of times, I added this and the light went off! I've used this in my boat (Mercury 75 4-Stroke), as well and it works wonders there, as well. I now have a box of these I use regularly.

This product was everything i expected it to be.... would highly recommend !!!

New customer and just started using Upper Cylinder Lube. In new truck, sounded better on first tank. Will know about gas milage in a few days when we take a highway trip. Gave one to my brother-in-law and he said his computer was saying 5 mpg increase on 2.7 L Ford truck with over 200,000 miles. Gas milage said 30 mpg.

This product is outstanding. I put in a small container every 3,000 with a fill up to keep all the moving parts in the engine clean and doing their job. I find the gas mileage improves. It is vital to deal with cheap gas as well. I try to select the station with the superior gas but it is becoming more of a challenge. The additive compensates for the inferior gas and is a must to keep the engine clean.

Awesome product really helps your gas and fuel system stay clean and running smoothly highly recommend try it and see the difference in your vehicle

Use every 5000 miles, great product

This fuel additive works great and I use it every oil change to keep my engine clean and boost my car's performance.

Great product to keep my engine clean, and slow down deposits.

Great product

I notice that I got better performance. Better throttle response and more power!

Just recently bought a 99 WS6 Transam that had been sitting for a few years and It had a rough idle at times. After using 1 bottle of this I could definitely tell a difference. The idle is much smoother. I am going to use 1 more bottle then start following the recommended time. Another great Amsoil product.

Amazing I used in all my 3 cars …. Love it

I love this stuff, my engine idles smoother and got 3 more miles to a gallon, love it.

I add this to the tank at filling and after couples Miles I can notice the change in quick shift response

Superior product I use it regularly and even send it to my daughter in Denver Colo. who loves it too . My son in Oklahoma uses it too . We are Amzoil believers and users !

Good