A recurring warning is that these are very expensive cars to restore and four-door sedans do not command premium prices, so owners frequently end up underwater. Specialists say they would not restore a W109 to concours level given the staggering cost and time, and that current restoration costs often exceed double the market value, which is precisely why the best sorted examples are worth a premium.
Restoration economics: costs routinely exceed value
Mercedes-Benz 250S-300SEL 6.3 (W108/W109) · market