I now have 260,000 kms on my 2006 Tundra pick up. The engine is as new thanks to Amzoil synthetic oil, filters, P.I. gas treatments, and this upper cylinder gas additive. No problems at all! This truck may outlive me.

Use it every oil change and truck run like new.

Bought a old used Subaru and everything Amsoil is great so I added to the cart and gave it a shot! Can't hurt being a Amsoil product.

Quality product that helps keep things running smoothly and efficiently.

Just great products

I think this is a must, especially for ls motors that can have problems lubricating the top end.

My order arrived short, missing the oil filter and 3 bottles of gas additives...would like to get an eta for the rest of the products.

This keeps everything nice and clean and running smooth

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.

Use it for the first time and really helped my mileage. Went from 6l per 100 kms to 5l. Made to Montreal on 3/4 of a tank, normally use a whole tank from Hamilton. Same for my wife’s Outback. So much better than Sea Foam.

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.

Truly an amazing product. At first I was apprehensive about this product. After purchasing, my son just purchased a 2014 Rogue. He was telling me he needed to take vehicle to dealer, he was concerned of a hesitation around 30-60kms. Dealer did updates and hesitation still persisted. He was taking it back and asked me to go. Unknown to him I added a bottle to his vehicle. He could not get over the difference. It actually cured this hesitation his vehicle was experiencing. Both of us ride touring bikes and use this product regularly. It makes an incredible difference. We can actually hear the smoother engine idle from using this and other Amsoil products.

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.