Just picked up my new R 320 CDI last week. Love it so far. It runs great but today as I parked it I noticed a cloud of smoke behind the vehicle. About an hour later I started it again and nothing. The car has only 200 miles on it. What's up with that?

 

I've got a GL320 CDI (2007 - first model year). About 4% or so of us (if the forums are to be trusted with these statistics) have had a problem with the intercooler hose coming off (first, that's a simplified explanation of the problem, and second it's only the GL so far). I drove mine around after the hose popped off the second time and there wasn't even a cloud of smoke then.

Now, I am in the Phoenix area, and it could be different where you are, but it'd suprise me to see smoke like that. I'd definately talk to a service advisor. It can't hurt, expecially while you're still under warranty!