I just bought a 1990 300CE, it is a nice car and I love it. I want to keep it forever but I don't know what to do with the problems I found so far. My main concern is...I see oil coming out of the exhaust and the exhaust smells like pure carbon monoxide. I don't see any indicator light on the dashboard about the oxygen sensor. The other thing that I want to fix are the moldings on both doors and on the edges of the front and rear bumpers. I seems like whatever is holding them needs to be replaced. Where can I get these things and will it be hard to do it myself? I really don't want to take it to the dealer bec they charge you an arm and a leg to fix it. Anyone who can help would be greatly appreciated.