There's a Bosch approved shop in S. San Francisco (or there abouts) that I have heard is excellent. Someone here posted info about it once as a link to a BMW site. Sorry, don't remember the name but someone else here might.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold