Customer Ratings & Reviews

High quality product and does what it’s designed to do

Not sure if it works but I'm not sure it doesn't

I generally see a half to 1 mile per gallon improvement in fuel economy when using this. I put it in when my fuel economy starts to drop under normal driving and seems to bring it right back up. Probably don’t use it as open as I should but I use it based on when my fuel economy starts to drop off. Works great.

I suspect this product is as good as all the other Amsoil products I have used. My first time trying this additive.

I drive a 2019 Sierra 6.2 l and I like how it runs but after adding the Upper Cylinder Lubricant it is so much more smoother and the throttle is not responsive. Great product.

increase my gas mileage about 2 mpg

Great as product, should be cheaper if have to be used as many times as recommended

Best product out there to clean lube the upper cylinders as it improves the engine performance with out doubt.”

I like old cars. I have three, and their respective ages are 15, 23, and 35 years old. One way I keep them running is through the regular use of fuel-additives. Amsoil's Upper Cylinder Lubricant helps clean out the fuel injectors and lubricate the combustion chambers of the engine where the engine oil can't get to. The UCL also helps clean the fuel injectors; if they aren't clean, your gas milage will be poor and you may get rough running. This product helps prevent that from happening.

Definitely better than any other lubricant I've used. Helps with the injector tick on my Mustang GT

I know filling up my tank at the pump is already expensive, but I use Amsoil Upper Cylinder Lubricant at every fill up in all my vehicles. I like the fact that it helps reduce issues associated with Ethanol in gasoline and keeps the upper cylinders lubricated.

Great product to regularly use to make sure fuel system is clean and lubed. Cheap insurance

Truck lifters ran quieter

been using Amsoil for 30 Plus years. my 2016 tundra just had the blower pulled to change the oil. The rice grinder has 97,000 miles on if . While blower was of we look down the intake ports to see if their was any carbon build up on or around the intake or exhaust port everything look good no build up. I use amsoil in the Engine,Transmisson, Differ,power steering. Brake fluid, Additive for the engine coolant, & I use their produce in My F250 Ford 265,000 miles and 2013 chevy Cruze. 50,000

I am on my second bottle and with all the cold weather we have can not let you much as of right now. With all the idling just to keep the truck warm I hope its doing it thing. Thank You. Back with more info when it warms up.

Why not treat the truck once in a while

Used this on my 2004 i35 and my 2011 M3 2.5, and what a difference! The idling on both are smooth, and eliminated the knocking! Not to mention a little better on gas👍

I have a 2017 Dodge ram truck and I use your upper cylinder cleaner it truly truly works in fact I studied all your products!!! I use your motor oil I use your gas treatment your products are the best on the market!!! I used to use Lucas which is good but AMSOIL so much better. Your product is five stars. I just want to thank you thank you thank you I recommend your products to all my friends and family!!! Dave From Delaware

I use it in nearly every tank of fuel

Seems to be working fine. I wish it would treat more than 20 gallons per bottle