+1 for the magnetic drain plugs. many different good ones are sold. I bought one for the 330XI i had from ECS tuning, and it seemed to work really well. Most wear metals I noticed was with M1 0W-40, GC (old) was middle of the pack, and the BMW 5W-30 synthetic actually did the best. But maybe the M1 0W-40 was just stiring up, and cleaning the neglect from the previous owner, as that was the oil I ran for my first 3 OCI's.