Serious rust and corrosion is, IMO, the one factor that can REALLY kill a car. You can't make any arguments about repair cost vs. blue book vs. depreciation and replacement car payments when there's a hole through your floor or if your strut tower has actually ripped out.
If you've got heavy, structural rusting it might be time to wave the white flag for that reason alone. No one will want to buy it, mechanics won't want to work on it and they'll start causing a lot of collateral damage when trying to do repairs etc... It can be a tough call.
Up here Krown Rust Control does treatments for about $100/year. Krown or something similar should probably be a part of any long-term owner's plan if you're in the rust belt.
If you've got heavy, structural rusting it might be time to wave the white flag for that reason alone. No one will want to buy it, mechanics won't want to work on it and they'll start causing a lot of collateral damage when trying to do repairs etc... It can be a tough call.
Up here Krown Rust Control does treatments for about $100/year. Krown or something similar should probably be a part of any long-term owner's plan if you're in the rust belt.