Hrmm...every vehicle I've ever owned the tail pipes turn black. I guess every car I've owned must burn oil.
Edit: That was sarcastic btw.
These are combustion engines that burn fossil fuels. There will be soot in the tail pipe over time. Also, keep in mind that these cars run REALLY REALLY rich.
I have some blackness in my tail pipes and my oil level hasn't moved. Lets not get worked up over nothing