I have about 10 driving miles on the car but it is the oil I put in it from the get-go. It has been started umpteen times and run for a 5-10 seconds (it was too loud to run it longer with open headers then). I have a good K&N oil filter but my oil is getting dirty looking and smells a little like gas. After I fire it up and then check it it looks clear though. Also, it doesn't smoke at all but it looks like the oil level on the dipstick dropped quite a bit since the last time I drove it. I just got back from another ride!