i bought mine high milage and am paying the price for doing so, here's my history:
1. bought the car, NA brake disks on my TT supra -> free fix by seller, but still
2. clutch started slipping so bad, normal acceleration was not possible (2 months of ownership)
3. valve stem seals gave way, car smoked up entire intersections (white smoke)(3rd month)
4. got new twins since along with valve stem seals (137.000 on old twins)
5. newly placed twins were leaking oil (oil return line leakage)
6. finally up and running again, car loses coolant, and a lot of it, its everywhere, leak at top of engine + radiatorcap gone bad (4th month)
7. today, the engine rattles (belt tensioner bearing) + car can't keep idle 15% of the time (dips to 300rpm and stalls) + other oil return line is leaking a little (the one towards the front of the car) +i have no more money (quess that's a common problem

)
so, i'm listening for sounds all the time and although i'm not worried about the engine breaking, i'm worried about some small thing that will break and mess something up, or damage my twins (which i can't afford to replace again)
I love my supra none the less, its just killing me that i have to worry about it breaking down every 500miles
Luke.