My 300cd also has more than it's purchase price in maint. receipts. This includes a new rear end, 20 hours labor to replace all rubber in climate control system, 3-4 drivers side window regulators (Guess what, driver's side is broken again)

I bet that car would last a few years of good service after some angle grinding and POR 15! I would drive it on a deferred maintenance schedule and not be surprised at all when the drivers seat, sway bar or battery falls out due to rust.

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1980 240d
1999 SL500