Same thing happened to me. I now keep several oil plug washers on hand and make sure the service people put a new washer on when replacing the oil pan bolt. Problem is the washer can only be used once and if you try to reuse it it will leak. Most oil change places dont keep MB washers around and the result is some dummie with a big wrench trying to stop an oil leak with a used washer. I think my dealer charged me $.45 each for washers.
[This message has been edited by Katttfishh (edited 07-19-1999).]