Customer Ratings & Reviews

This stuff works! My truck has increased hp and mileage.

This thing works magic!

I use “top tier” fuel and figured I’d add a top tier fuel additive. I plan on following up with AMSOILs P.I. Performance enhancing fuel additive at every oil change just to keep things running well.

I have used this product In both my 1999 Lexus 300ES & 2003 Ford Explorer Sport for four tankfuls of gas. While I can't tell you if it lubricates the upper cylinders, I can tell you that it has improved the MPG in my Explorer by 1.5 MPG and in my Lexus by 2 MPG. Thanks AmsOil.

This is more like an update on this product. I've used this almost five years on a 2018 Ford Edge Duratec engine. Early results showed about a 3 tenths of a mile increase in gas mileage (This is my wife's car so no feathering on my part to get better mileage). Two other brands I had experimented with gained 2 tenths of a mile gain in mileage. The reason I started using this was to lessen wear and extend the engine's life. Can definitely recommend for a multipoint injection engine. I would hesitate to use for a direct injection engine. No unusual deposits on the tail pipes but it appears to have blackened a K & N air filter after 50 thousand mile so an oil catch can would be beneficial. The engine is in perfect condition along with the catalytic converter. I plan to to add an oil catch can soon.

Have used this Product in both my vehicles for years and have had no issues with fuel delivery, both run very smoothly as when they were new, A++ Product

SIMPLE THE BEST . INSURANCE INSURANCE

All products or lubricants are instantaneous, this 1 is not the exemption.

Use this top cylinder lube & feel how smooth the engine operates. It almost feels like the engines has just been tuned it runs so smoothly.

I recently purchased a 2005 pickup truck that ran a little rough. I decided to get a case of AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor, hoping to see some improvement after a few tanksful. Well, the improvement was VERY noticeable before I used the first tankful. I'M A BELIEVER NOW!

Very reasonable cost for a little added protection for the most important part of my vehicle

Run this in your ride and your car will be happy.

When your car pick up is a little sluggish, you should put one bottle Of this Gasoline additive And you will see the difference in no time. Great stuff. You need to try it.

Use it in 7 of my vehicles every 5k and 1 vehicle recommends only super (high octane) been using regular gas and 1/2 bottle of this instead. No detonation, no loss of power, no oil consumption, great fuel mileage. Vehicle is now at 290k and still purrs.

Well recommended

Many people do not understand that the upper cylinder area stays "dry" and leads to wear and carbon deposits. Treating your fuel helps reduce wear and carbon deposits. Top tier fuels have some additives that help....AMSOIL finishes the job for me. Every tank gets this in my cars. It helps me trust those smaller gas stations that are not too tier fuels too.

How do you know if it helps? Just keep adding it to gas tank. Upper cylinders need extra lubing and the only way to really know if it is working properly is to tear down the engine and look at the parts. I'm not doing that, so I have to trust that it's helping.

I purchased a case of these on the recommendation of a friend. I was actually skeptical, and thought I’d try it out. After I got to .25 tank of fuel I added to fuel tank. (It works well in capless tanks). I filled the tank up with 93 octane that I always use. I didn’t notice much, except the power seemed to rise. The engine seemed more peppy. The mpg went up from 25.0 mpg to 25.2. The engine is able to run more efficiently, and with that comes a rise in horsepower. I really like this product, and add a bottle on every fill up.

This product seems to be working as advertised. I'm please with its purpose for use.

I run e40 ethanol in my Elantra N with a n upgraded intake and fuel system. I just feel it’s vital because of the high ethanol content of my blended fuel.