Customer Ratings & Reviews

Seem to be helping with the mpg will continue to monitor. When your spending a grand a month on fuel you take what you can get

I have noticed that my injectors are functioning smoothly after the installment.

I purchased a case and have been very satisfied as both my vehicles are running great. However, my shipment showed up with an oil stain and when I opened the box I found one of the bottles cap was loose with seal broken and the fluid leaked all over the box. Then found a few more bottles with loose caps but the seal still intake.

This stuff is a great fuel additive. I've used it in three vehicles and the results are amazing. Regain in HP and smoother idle are easily noticed. Highly recommend.

Wanted an upper cylinder lubricant that didn’t effect gas mileage. So far, I don’t see a mileage difference from use/non use. Using at every fill up.

It poured in my gas tank with no problem

I use a bottle every 2.5k

As expected!

Adds the necessary lubricity to the upper cylinder regular gasoline doesn't. I use this regularly in my Shelby GT350 and occasionally in all my other vehicles.

This stuff is pretty cheap and seems to work pretty well. I noticed a bit of a MPG increase when driving my mother's car as well as a tiny bit smoother engine idling.

A+

Not happy that you removed the easy pull tab that seals the bottle. The current method you have to pry off with something sharp and causes it to come off in sections causing pieces to fall in bottle.

Smoother sound

To me, upper cylinder lube should be used always. Gasoline is not a lubricant and is pretty rough on engines. We lubricate everything else so why not the most abused part. The best thing is it doesn't hurt the catalist converters or the O2 sensors.

The engine seems a little quieter since adding the UCL to the fuel. I intend to buy it again.

I have been adding this lube to our Camry fuel and it seems to work well. Started using about a year ago.

Use it in my tuned 2018 540i 450+HP 500+ tq. I run higher octane fuel 90% of the time, or an ethanol blend so every couple of tanks I run normal 93 octane and a bottle of this and the P.I. Keeps things running smoothly and clean. I use all Amsoil fluid in all my vehicles (engine oil, transmission fluid, diff fluid) and have never had issues or experienced any abnormal wear.

Some noticeable difference in the engine performance after adding the Upper Cylinder Lubricant.

Helped improve the running on a used 2007 Honda Accord.

Have been experimenting with upper cylinder lubricants since last year. In a 2018 Duratec engine, it appears to boost mileage about 3/10ths of a mile per gallon. Added on top of Amsoil's own research showing reduced wear at the valves, this makes it great choice for engine durability. I add at a rate formulated per gallons of gas needed for refill. This makes it more economical to use by adding the remainder to the next refill (properly measured). The bottle neck does catch on this Ford's capless gasket, so I still need to use the car's provided funnel to add to the tank.