Customer Ratings & Reviews

I can say I can't tell using it but I hope it's working. I will say they need a easy tear top on it as it's a pain to get off as is. That's why the 4 star.

This is a must fuel additive at every fill due to the "oil dry" area of the upper cylinders. The only time I would not use it is when running a PFI based cleaning additive.

It does what it says it does

Noticed immediate results after pouring a bottle of this product in my GMC Sierra 5.3 with GDI.The solvent with in this product must have cleaned out the injectors that spray directly into the cylinder that get fouled up with this type of fuel delivery system. This is now a must in my maintence regiment. Amsoil you got a great product in your inventory👌

The addition of one bottle of upper cylinder lubricant with every tank of gas is an easy maintenance practice which should keep your engine running (like mine) for over 300,000 kms without problems. I also use the PI additive when going on a long trip and the two together really seems to make a difference. Here's to the next 300k!

It's inexpensively priced to do preventive maintenance on your injectors and all other stuff fuel related

A lot of gas today just lacks in detergents and lubricant.. this helps with that. I use with every fill up.

Works well

Noticed a improvement all around

Use regularly to help keep upper cylinders lubed and injectors clean. A must if you are using less than top tier gasoline.

This is one of those products you don’t feel immediately, BUT you notice over time. I use it as part of preventive care to support upper cylinder lubrication, especially in a direct-injection turbo engine (BMW 120.000 miles on it ) and a dual turbo injection (Ford Maverick EcoBoost with 22.000 miles) The engine remains smooth, refined, and wellbehaved even at higher mileage. it’s an excellent complement to quality fuel and oil. great product

Fantastic results. Been using in both vehicles every fill up religiously for over a year now. Fantastic results.

Put a bottle of UCL into each of my vehicles along with a bottle of PI. Neither vehicle showed any difference in any metric at all. Save your money and pass on this one

Is good I used this product for toyota tundra 4.0

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.