The proper thermostat does not open until 87C... so it's pretty normal for that motor. The 77 or 78 is too low for proper operation. I would consider checking the fan clutch and radiator. Mine will get into the mid 90s often but not much hotter. This is with a new rad, new clutch fan, proper coolant, etc.

I have a few cars with fantastic interiors and they rattle/squeak big time.

Yes, HVAC is run on vac. Sounds like it has a leak somewhere.

Car probably needs flex discs, bearing, shocks, and see where that takes you.

$4300 is too high for that car. I'd pay maybe $2500 if the paint is fantastic to match the interior.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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