Let us know who the criminals are so that we can avoid them in the future.
My example is 2300€ in Angouleme and 1050€ in Bochum. This for an ignition control module. Bloody disgrace. By the way, Angouleme and Bochum are both in the EU!
NEVER accept the part recommendations from AutoDoc or Euro Car Parts (I don't know them but the same rule applies).
ALWAYS get the correct part number from MB and then find compatible alternatives. The only way in my opinion.
Just thinking aloud.
My diff whines a little at 80 kph and that's really annoying given that the speed limit on our local roads is 80.
Most of my 300CE-24 had been renewed but the diff may benefit from renewal or replacement. I've spent so much already that the cost may be forgotten if it did...
True. So one needs to judge for oneself, based on the feedback that one feels is both informed and impartial. Not easy, I know.
My policy is to pay the premium prices for original parts whenever I cannot perform the replacement myself or when it is a critical, safety-related component. So far...
I feel that a different, more prudent mechanic is your starting point.
If, as I think, he has played with the mixture control (3mm allen key), without knowing what he's doing, he is not the man for the job. Do you see lots of 80s/early 90s Mercedes at his place?
And if he's used the mixture...
My more recent (1991) auto box was overhauled successfully by Manual transmission repairs | Mackie Automatic & Manual Transmissions. They are in Glasgow but the box was shipped to and from them from Portsmouth for a reasonable price.
They appear to do auto/manual/industrial and other...