BMW x3 had noticeable 40hz vibration and low rumble while driving. Engine performance and idle seemed ok. Engine exhaust smelled of unburnt fuel. Poured a can of this engine ambrosia into a full tank of gas; 2 days later there is no more vibration, ride is smooth as silk, no more unburnt fuel smell. An injector must have been clogged and this fixed it. I'll be using this and the valve cleaner regularly after each oil change.

Follow the directions.

great product been using it for years on different BMWs

I use it every few tanks when i do my Italian tune up, it gives the gas a nice boost and keeps my fuel flowing right.

ordered a case of this for use in my boat engine and had several cans left over, so dumped four into my very used nissan truck's fuel tank. I noticed a profound improvement in smoothness and response the next day. very satisfied that this product is effective in automotive applications. Plus this change had taken place after prior use of techron products!

I use this with every oil change on my car and I can recommend it 100%. I can always feel the idle much smoother after using one of this.

Maybe the injectors were already clean (HIghly doubtful in my heavily beaten, 8 owner 96 328i), but I didnt notice any improvement after a tank went by. Did plenty of highway driving as well to help it along. Idk, maybe my butt dyno is broken. I'll have the injectors taken in soon for a proper cleaning, and then I'll see if this did anything.

Great fuel system cleaner. Used on my Volvo S40.

I use this and Seafoam, can't go wrong with either one.

Great for highway speeds!