Thought it would be useful to have a TSB thread for those encountering issues.
Given the recent number of posts regarding moisture/flooding in people's cars I searched but didn't find specific to water/moisture penetration due to rain. I'll take whatever TSB's are posted going forward and consolidate them here.
Auto MD TSB List
2011 X3: TSB - Moisture/Temperature Related Issues
Bulletin Number: SI-B11-08-03
BMW: OIL SEPARATOR-COLD CLIMATE CONDITIONS. CERTAIN AREAS OF THE US EXPERIENCE EXTREMELY COLD CLIMATE CONDITIONS DURING THE WINTER MONTHS. A SMALL NUMBER OF VEHICLES HAVE EXPERIENCED PROBLEMS RANGING FROM LEAKING OR BROKEN VALVE COVERS T
Bulletin Number: SIB-11-08-03
BMW: SIX DIFFERENT MODELS EQUIPPED WITH THE M54 ENGINE COULD HAVE VALVE COVERS BREAK IN COLD WEATHER AND RUIN THE ENGINE. THIS IS DUE TO MOISTURE ACCUMULATION. *RM
Bulletin Number: SIB-12-07-11
BMW: THE ENGINE WILL NOT START BECAUSE THE ENGINE COMPARTMENT PARTITION WALL IS FITTED INCORRECTLY ALLOWING WATER TO DRIP ONTO THE CONNECTOR STRIP OF THE DME CONTROL UNIT LEADING TO INTERNAL DAMAGE OF THE DME. E70/E71. *RM