I have an '86 300E with 165K and the economy gauge is not at the end on idle, but the car is fine. I replaced the motor mounts my self a few months ago, no biggie. Just need the right tools. I don't know about prices but you could ask them for the rates book and their hourly rate and go from there.

Gook luck



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'86 300E
'87 300SDL
'92 190E 2.6