There is a thread somewhere on this forum that has recommendations for mechanics. I've had reasonably good experiences with JP's Mercedes Repair, and Austin ********. I've also heard good things about Phoenix Motor Works, and plan to try them next time I need something done. There are a couple others I've heard mentioned favorably, but with caveats. Like Ben's Workshop, which does very good quality work, but is expensive.

For fuel injection parts and work, I've taken my Ford F250 to Austin Fuel Injection and Performance. I usually go to a Mercedes-specific mechanic for the Benz, but I mention this place because they will test your injectors for free, and have good prices on new fuel injectors and pumps.

Good luck!

Dan

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1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine