I have an 03 745Li, and i had some tranny issues the last few weeks. Specifically first gear holding way too long (like up to 4000 rpm while driving slowly in a parkade, and then slamming into second gear. took to dealer, and I was down 2 litres of fluid! Supposed to be a sealed unit, but SA said once a leak developed they then recommend replacing fluid at some point. Anyways, topping up the fluid has brought the tranny back to working as good as new. Dealer thinks tranny may be on last legs, and a new one (rebuilt) installed was quoted as $10,200.00 (Yikes) and that's in canadian dollars. I'd certainly check your fluid levels before anything else.