Y'all must be in love with your vehicles, I would never put up with so many problems that some people have listed in this thread. Maybe I just found another benefit to staying stock and not dumping a bunch of money into mods. I would struggle to unload a problematic vehicle if I'd already spent a bunch of money and time and sweat on modifications that don't increase the value of the vehicle.
2006 Tacoma with 168,000 miles: A/C condenser at 105k, water pump at 150k and valve cover gasket at 165k. Otherwise just normal wear and maintenance items: brakes, belts, battery, hoses, filters, fluids, alignments, etc.
1995 Corvette with 80,000 miles: heater core, power steering pump, sway bar bushings, brake hoses and front air dam (spoiler).