I feel your pain. I've had my '91, 525ia since new and have come to love this car. I gave it to my daughter as her first car while see was in high school. She( like your older son) was very responsible with it. She now has a Jetta and I'm driving the 525 as my commuter car until my son reaches driving age. I hope he can be as resposible as she was. Fortunately or unfortunately the only problem with my daughter was her speeding. Of course I got the blame for giving her a fast car. Go figure!
Will