people told me that it was because i put too much motor oil but that day i had raced and pushed my car to 120mph so i didnt know if it was because i pushed it too much or because of the oil so can anyone tell me why white smoke is coming from my muffler and if it is because of my oil could that do any harm to the motor and if so what could have happened?it recently stopped smoking but the performance has gone down alot it doesnt run like it use to it got slower