Here is a helpful string that came up via Jerich0's Google search suggestion above. Thanks Jerich0.
http://www.bimmerfest.com/forums/arc.../t-486008.html
Re the noise heard in a '13, let me clarify: We listened outside, and I was personally unsure about whether I was hearing it or not. The dealer folks took it inside, and then told me that they heard it, but a more quiet version. Maybe they were just playing the "they all do that/it's normal" game. So far, they are being helpful. I am taking the X5 in a week from today, and taking a loaner. Based on what I am reading, I intend to start working with the dealer to get the oil pump scenario teed up in advance, to the extent possible. I do not want to wait weeks for parts to come from Germany!