Yes, but then, there wouldn't be an oily residue.
Neither from the AC bearing.
The only oil present under the hood is Tranny, Power Steering, Engine and Brake (yes, and some ounces for the AC also).
Could be the power steering pump or reservoir ...

Attached Images

  

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2010 X5 35d Black - Full (current)
2012 X1 28i (retired, won't be missed)
2007 335i sedan (retired, and missed)