Well eventually they just get tired. Everything needs work the suspension, interior, exterior, engine, trans ect. Rust also plays a major role. The 420SEL I parted out had a pretty good body but their was some major rust underneath. Also everything was just shot it was tired.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200