This same car is even visible on Streetview in Google Maps:
https://goo.gl/maps/Xev7SMofyvtAJR2a7 The repair shop is Klaus Nagel. I am brining my car to him now for many years.
He is a old-school German car mechanic. A bit quirky perhaps, but he knows these cars like few in the Bay Area.
He updated my cooling system (e.g. drive to LA on the I5 at 90F/>30C heat without issue), installed a shorter ratio rear-axle (big change in drivability!) and many other things that make it a joy to drive.
Even the Mercedes Dealership sometimes calls him or sends him cars when they are stumped.