Great stuff.
The Audi link isn't working for me. Nice collection though.

I will try to contribute with a collection of general mechanical repair & diagnosis procedures.
Just scroll down. Lots of info that applies to different makes including BMW.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.