Put in tank trying ascertain appears to be snappier

Works very will. will buy again

I poured in a bottle of Ventil Sauber before filling up then went on a 300 mile road trip. Didn't notice any difference while driving. Started my car up the following day ( mind you I didn't even remember I used the Ventil Sauber ! ) and I noticed that the engine was more responsive and was idling much better ! It was then that I remembered the Ventil Sauber....its a really good product and i'll buy a lot more. I changed my oil a few days after the treatment as recommended on the BMW forums.