Got to be bimmerforums
Owning a BMW I have registered over there. Only problem with their search feature is when locating the item of interest, you have to go through 1,000 threads that tell you to do a search
You are correct, there are not to many people interested in car preservation or DIY.
I have found a very good DIY for the various models at
http://www.bimmerdiy.com/e30 Hopefully you can find this usefull - no BS just information.
Think I have my "E's" and "M's" figured out now