Another vote on a Subaru. It was a 2000 OBW with the EJ25. I bought it “low mileage” 1 owner car and what a miserable pile of crap it was. Front suspension, rear suspension, alternator, ac compressor, power steering pump and the rack, intermediate shaft, window regulators, seat belt retractor (who’d have thunk?) and oh, the lovely HG. The rear brakes needed a ridiculous swivel socket to get the caliper bracket off. It was gutless in commuter traffic and this was before I knew how to DIY. Spent way too much money on that garbage of a vehicle. Only positive was the giant wagon trunk. Literally should’ve rolled that thing off a cliff. Worst 40k miles in a vehicle.
A close 2nd is a 2011 Malibu. A CPO vehicle that I purchased that was 2 years off lease. The extended warranty I bought came in handy - new moonroof, new passenger seat, 3 sets of front struts, 2 sets of front control arms, 2 sets of rear shocks, new ac compressor and ac evaporator, 2x steering column, all 4 regulators were replaced. Dumped it right on the 36th month. Owned it from about 38k miles to about 60k miles.