We have a A6 Audi Quattro, 1999 when we first boughtit about a month in a half into owning it white smoke was coming from under the hood down by the coolant our mechanic said it was probably from the oil burning off from my son doing an oil change. It stop for a while now it is starting again. the gage reads fine not hot but he has used some oil hope someone can help thank you concerned parent.