Packing was very professional! No complaints. Can't speak for MPG change as I have not owned the car long enough, but have noticed some improvements with the smoothness of the engine. I read it is not recommended for use with Liquid molly oil.

Can't really tell if it works performance wise, but what I did feel was the engine runs smoother afterwards. More than likely will be using this product more often as indicated.

great product

Mild improvements in MPG were noticed about 600 miles after application.

I'm using this along with the engine flush and fuel system cleaner and the results have been great! Engine runs cooler than before and my MPG went up about 10% after 300 miles in. Engine is also quieter.

I use this at every oil change!

Quiets down some of the lesser tics that you would hear in a healthy engine.

I’ve noticed my car now runs a lot smoother and quieter. Would definitely recommend as a preventative maintenance.

CERATEC product is awesome! I have been using it since 2008 on multiple (benzine/gasoline) cars and it does make engine run smoother. Some more (normally older cars) some are less noticeably - it worked for me.

I cannot say enough great things about this product! It made a marked difference in the smoothness at idle, and my truck seems to love it.