Figured I'd add to this thread as well. I'm also looking for service in or near SF for my '85 190D. I ran across this:

http://www.yelp.com/search?find_desc=Mercedes+Diesel&find_loc=San+Francisco%2C+CA

Sal's is definitely high on the list but I was wondering how he compared to Datona and Hans Art. Perhaps Sal is more MB is more likely to be familiar with the old models?

I'd love to hear thoughts. I'm really trying to avoid driving to the east/south Bay!

Thanks.

Edit: Just called Sal's and the guy I spoke with was nice and helpful on the phone. I'll most likely be taking my car there Friday but would still love to hear about the other shops.