I've completely given up on anyone else servicing any of my vehicles. The experience that nailed the coffin shut personally was getting my valves adjusted. I had no time as we were leaving on holidays and I was busy tying up loose ends at work so I took it in.
Understand this is on the 409 and I knew it would be a little more trouble as you need to have two people... one to check the cam and the other to turn the crank from underneath.
As I can do the entire job on the 126 in 45 minutes I was expecting to be billed 1.5 to 2 hrs. I was billed over $500!!! And I supplied the gasket!
When I asked how that is possible they explained they had to remove the grill (two tabs... do they charge for opening a hood!?), they had trouble removing the engine cover (how is that my problem?), and that they had to remove the oil filler neck... 4 - 6mm bolts (10 minutes off and on tops).
Ultimately they gave me half back in credit but I can't see myself ever being able to use it... I just don't trust them.

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I don't know the same things that you don't know.

Shayne

85 W126 SD OM617.951
87 409D 650S OM617.913
93 E34 Touring M50B25TU
02 E46 Sport M54B30TU