That's unfortunate. What was it?

Our '87 325 only had no mechanical problems, but the A/C went out as did the motors to raise and lower the windows, and something got caught in the passenger seat rail that made it get stuck all the way back.

Mechanical problems are the only thing I'm really worried about though, and those issues only arose once it crossed about 200,000 miles...so I'd say the car was pretty solid.