"Painted twice since I've had it, to prevent rust (probably due again)"

If that isn't the most suspect thing I've read in a long time...
As someone who lives in the rust belt and owned my share of crappy rusty beaters, any time someone is selling a car that was just painted, or "just needs paint to fix rust" it's a sham. That's code for RUN REALLY FAST.

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1984 300TD -- summer daily driver
Many others that aren't Mercedes...