i know on fresh swaps like my b16 it smokes a light white smoke at start up and only for about 24hrs then stopped b/c the motor sat for a while. i thought oil burn usually had a bluish tint to it, coolant is dense white, and a lil moisture is a light white, black is fuel, but i could be wrong. much more info is needed on this one for everyone to help you. i rebuilt a y8 years ago and it smoked white for a few hours then stopped but the car and motor sat for a while.more info please. car, setup etc.