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Originally Posted by The Cleaner
It's the pulleys, the bearings go south and make that noise. That is a very common thing to replace on the M50-M56 motors...
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Sir:
On an aside, doesn't the X5 have a serpentine belt? Understand your comments relative to the pulleys but I was curious about the belt. Under 'normal' conditions when does the belt need to be replaced? 70K+ miles?
Thanks!