I know theres alot of seafoam question threads, but if i put it through a vacum line to the crankcase, what do i do next? I read on some other forums you empty it? How do i do that. I thought u just left it. Does it come out with an oil change? i dont get it. also, is putting it in ur gas tank make ur car run ****ty? I have an autox event coming and im curious to know if makes ur car run lean? Thx for the help in advance. Peace