Drive it into the ground, tbh. If it passes inspection, and drives nicely enough, no reason to piss away your money. Cars are money pits as is.
My spare, a 92 Daihatsu with 100K, just passed inspections yesterday, putting out 10% of the allowed emission. Worth maybe $500, but worth a heck of a lot more as an indestructable Japan-o-city-scoot.
Cost of ownership last year: $10 for oil and a wiper blade.