A consistent warning is that these are among the most expensive cars short of a Rolls-Royce to restore, with parts costs, scarce specialist labor and no realistic path to profit. Owners cite figures like $200k invested to reach top condition, and caution that a survivor 'project' needs everything and will cost multiples of the purchase price.
Expensive and complicated to restore
Mercedes-Benz 300 Adenauer (W186/W189) · ownership