I can answer questions relating to the BMW E30 3-series cars built from 1984-1991 (1992 for convertible) in the US. I know of the problematic areas in these cars and how to fix them. I know most parts of the car including: Electrical, Engine, Transmission, Differential, Suspension, etc...
I have owned 6 different E30's over the last 10+ years, and know almost every nut and bold on the cars.
BMW Car Club of America