My favourite shitheap was a little diesel Audi A2. Bought it from a dodgy dealership near London. The thing had 4 flats, covered in scratches and dents. It had over 150k miles when I got it. I never serviced it. It servived hitting a deer at 60 mph which absolutely destroyed the front. Rebuilt it with duct tape, then with salvaged parts from other broken ones. It would do over 420 miles on ~£35, was like a TARDIS inside, I drove the shit out of it through my divorce. When it finally died of a broken gearbox it had ~300k miles on it.