Ok stupid question but I did search and can't find an answer and I know someone on here has to know this. My stepson's car 1997 Grand Prix GT 3.8 na lost the upper intake gasket. I replaced upper and lower but he did run the car long enough to get some coolant in the cylinders. I pulled the plugs and turned it over to blow out what we could. How long will the car run til white smoke goes away. I have only run it for a few minutes at a time because it starts right up and there is no knock of any kind but I'm nervous to run it too long as we don't have the money for a new motor and replacing gaskets is a much better deal.