3 More Really Good Links.
Work Order for Oil Pump:
View post on imgur.com
Viddy with "The Sound":
http://s146.photobucket.com/albums/r...W_X5_Whine.mp4
I watched and listened to the Viddy above, and heard exactly what I was dealing with. My problem was solved as soon as they replaced my Oil Pump. Absolutely no question about it. The work order was helpful; however, there is an easier way to replace the Oil Pump. My Tech did not have to drop the engine. The Bimmer Techs at the BMW Mothership are well aware of this problem. They just don't sing about it!
Hope this helps!