I have a 1992 318IS. Let me tell you...My car is falling apart. Everything but the motor, go figure. I have 165,000 miles on it now and it runs great!. But here are the problems I've had...Replaced suspension all around, replaced battery and alternator. Electrical stuff thats gone bad are:
1. Sunroof crapped out
2. Drivers side window doesn't roll down or up anymore
3. Wiper wash motor doesn't dispense
4. On Board computer, only clock works (7 button)
5. Passenger side seat is stuck in a lean back position
6. Airbag Sensor came on while I washed the car and won't turn back off
7. Exhaust leak
8. Door panels are falling off on both sides
9. Headliner is falling down
10. ATF leak in power steering pump
Other than that the car runs great. Thank God I have my 1995 M3 as my weekend driver which is in perfect condition with low miles. I refuse to get rid of the 318 because it has done me well. Yes it gets annoying with the stuff that doesn't work but for a daily driver of more than 50 miles a day, the car is perfect. I'm roughly getting about 30 MPG still. My M3 gets about 20-23 MPG if I'm lucky.