When it comes down to it, search results always pull up peach parts and benzworld. The benzworld threads usually do not have very good info. Too many self proclaimed 'experts' that figure they are the only ones that can work on a car in their garage and 'did you try a search first?' responses. There's a UK site that has a lot of good info. It doesn't pop up in the search results often. Maybe on purpose?.....

I have a friend that works on his BMW motorcycle. He went the route of a paid forum. It does solve a lot of problems. The trolls run out of credit card numbers to keep making accounts, etc