busbus

I just noticed lately since last oil change that there is black oil deposit coming out of the exhaust pipe after I started up the car in the morning. It's not leaking but like spraying oil vapor from both pipes. (More on the passenger side) I dont know if it's engine oil or gasoline but it leaves stink on the ground and the chrome exhaust tip is now completely black. Exhaust is all stock. I don't seem to see that after I drove to my destination.

I read that people suggest it's carbon and it happens when engine is running rich in fuel. Is it normal for your s2k or something I need to be concerned of and bring it to mechanic? I just bought this ap1 for 4k miles and haven't noticed that in first 3k miles before the oil change. Wonder if this is normal for s2k after running for a period of time or something broke on my car?