Clean you Gutters!
Was washing my car today and decided to pop the hood. Noticed the "gutters" were full of pine needles and leaves. The water coming down from the roof wasn't draining quick enough. Immediately remembered a story of friend of mine who had all the electrical stuff fried in her Audi A4 because of clogged gutters. The repair cost her several grands.
Just want to remind you guys to check your BMW "gutters" every once a while; we have a lot of pine trees here in PNW!