Engine Whining Noise
I have 2010 X5M with 17,000 miles and am experiencing a whining noise as well. The whining noise is very loud during low-speed operation or when in a lower gear and for some reason while climbing, if that makes sense. Where I live there is a hill, 25% incline, when I begin to climb while in automatic the vehicle downshfits to (2D) and the sound is even louder. During flat surface driving it is very loud when I am in sport mode and at a low gear.