Quote:
Originally Posted by rdeyoung
I took it in about a week or so after I heard the noise the first time to a reputable BMW service shop in town here in Glendale, ca for an oil change and mentioned my issue. They checked out the hoses and the steering pump and said that they don't see anything unusually and everything checked out ok except for some minor leakage in the hoses... 
Thanks! 
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minor leakage in the hoses = PS fluid low and causing whining sound???
After topping it off (make sure you don't overfill, there is a definitive MIN and MAX on the PS reservoir dipstick, if you have leaking hoses you might want to replace those, shouldn't bee too hard to replace the hoses and reservoir.