Engine Light

My car just peaked over 40,000 miles. Its not a Pontiac but actually a Daewoo, however that area is pretty dead and I use to own a grand prix and remember how helpful you guys where. I just recently changed the oil in my 1.6L to synthetic oil. After running it for around 600-700 miles my check engine light came on. It was easy to spot the problem when I took my oil cap off and smelled gasoline. Usually, I believe,this happens when the piston rings wear out gasoline leaks threw and gets in the oil, however at the same time I am not burning any oil at all. Im not an expert at synthetic oil as well, so I dont know if it had anything to do with changing my oil to synthetic as well. Im taking it in tommorow to my shop at school to get it scanned, but I wasnt sure if I should try just changing it back to reg oil or not?? - Thanks

The synthetic oil will not cause this issue although the synthetic oil tends to clean better than the dyno oil. I think your issue is probably a sticking injector or bad O2 sensor that is allowing too much fuel in the engine and therefore you are smelling fuel. Along the same lines check for leaks just to make certain that the fuel lines are intact. Once you get the codes if you post them that will help diagnose the issue.

you should get another GTP and forget the daewoo, they obviously suck. nobody even types in there forums hahaha. :grinyes: .