Life is FAR too short without worrying about keeping every thing "perfect" for the NEXT owner(s) after you're pushing up daisies.
Having "custody" of a car is not most folks idea of enjoying it.
You gotta decide if you're an actual driving enthusiast, or a market speculator/"investor".
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**** Allowing for inflation from 1987-to-2003, supposing the GNX sold new for 35K (many sold for thousands more), how much money has this "investment" made while taking up space for the last 16+ years? ****
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Sorry...sounds like a headache no one needs...minus a museum with maintenance personnel.