$550 for all that? that sounds pretty cheap to me, as long as it works, even if for only a couple years. youre driving a mercedes, either learn how to do all of this stuff yourself, or be willing to dole out a few bills every once and a while. i rarely get away from my mechanic without giving him at least $300, but my car runs great, and im happy.

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350