Decided to drive my z to work this morning. Got on it a couple times on the way here (60 miles). Parked it and got out and popped the hatch to grab my bag and my hand slipped off the spoiler due to a film of oil all over it and the tail lights and rear bumper. My car does not have a history of blowing smoke. I'm stuck at work for another 5 hours and its driving me crazy. What do you guys think happened?