I realize that this is a 5 series forum, but I have received so much good information here that I am looking for more. Hopefully there is some familiarity with the 635i as well.

I have a chance to buy an '87 635csi pretty cheaply. The car is a 5-speed with 133k on the clock. The body is good, with a (very) little surface rust on one fender, and the front air dam is damaged and needs to be replaced. The interior is very good and all the electric options work except one of the power headrests.

I am familiar with the powertrain, as it's essentially identical to my '90 535i. I am looking for information as to what else I should be looking for. What are the weak points of the car and what is the general consensus as to what the car is worth.

Thanks,
- Hal