Thanks pizzaguy and Wadsworth. I'm waiting for a response from the service dept at the local Mercedes dealership. My VW mechanic doesn't want to do it so hopefully MB will. I called the local Chrysler-Jeep dealer and spoke with them and determined they didn't know what the hell they were talking about. If I can't find someone I'm comfortable with I think I'll just buy the oil, give it to her and let her ex-husband who's supposed to be a great mechanic, do the job Thanks guys- Merry Christmas !