You're looking at a W210, which is the car with rust problems at suspension perches and door seals.

If I were buying one, first thing I would try to do is establish good relationship with dealer. Perhaps even get PPI (prepurchase inspection) done by dealer.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles