Customer Ratings & Reviews

Noticeable results

Immense difference used three bottles in three fills and boy do 😍 I love it!! 08 Lexus is250

No more Hemi tick

Not a lot of time has passed so can't comment a great deal

Good gas treatment… the motors top end ( meaning) valves runs soother quieter…with fuel injection cleaners.

I have tried other upper cylinder lubricants, never noticed any real difference when using. But 1st use of Amsoil I noticed the engine in my Tacoma, and my Scion TC ran a lot quieter and smoother these two changes convinced me to purchase a whole case. Gas mileage increased slightly.

Great product.

I used this for about 2 years with every oil change and never had any problems plus I always use top tier gas high test

trust AMSOIL products

Engine runs smooth, and better mileage,

Trips out west get you ethanol gas mix. Hoping this cleans out the remnants.

Works like it is advertise and maintains my fuel and engine clean. I recently had a clogged fuel injector and it was throwing a code. I threw in a bottle before my fill up. As I was already had plan on taking it to the mechanic to see if we could get the fuel injector cleaned out or replace. The code went away and I gain back my 2.0mpg I had loss. Now every month I run a bottle of it in my vehicle to maintain my fuel and engine happy

Periodically add to SUV when filling tank. Improves performance and easy to use. Highly recommend.

One bottle every month my suv runs so smooth and quiet.

Use in my vintage car with every fill up. These old cars may not be the best at lubricating their top end. Having the fuel with extra lubricants and anti corrosion agents coating the valves reduces wear and improves performance

I'm a l9ng time user of Amsoil and highly recommend all of there products. My son bought an 88 Mustang GT that had low mileage but some lifter noise so I purchased a bottle of Amsoil Upper Cylinder Lubricant and added it to a fresh oil change. I immediately noticed it quiet it down .

The engine is smoother and quieter when using this product daily. I also noticed a 1-2mpg difference on highway when it is on a full gas tank. The acceleration is much smoother at light and part throttle on the highway.

Not a big fuel additives fan. But this stuff after a few tanks? Shows a difference in overall protection

put it in and it works great

Between a bottle of UCL with every full tank or two half-tanks, Signature Series motor oil, an EAO17 oil filter, and always using Top Tier fuel, the 3.0L TT V6 in my CT6 still runs strong. Have never had an oil-related issue, have never had a problem with the turbos, and mechanics tell me the engine looks great, especially considering it’s 10 years old. Same with my wife’s 11 year old Terrain with the 3.6L V6 - runs strong, looks great. I’ve been using AMSOIL in my cars for over 20 years and II can’t recommend them enough. I’m a customer for life.