I have a 1993 3000gt mitshubishi that I took to get it smogged, it ran fine but the day before I took it in I had drained the oil, refilled it . so when I got it to the smog station it seemed to smoke real bad after sitting and idling. Needless to say it did not pass it, So I thaught I had over filled it. Since then I have had the worst luck trying to get itg passed. Can you tell me if there is a additive that I can put in, so that it will pass?