The problem is that this worm gear screw is knackered.
This may come from a TOO frequent actuation of the Xdrive.
I have just been told that a BMW PuMA case would blame the asymmetrical wheel mount..
Wider rear tyres give a bigger rolling resistance and would make the transfer box work more often.
Can the people in this thread who once had the problem confirm wether they have asymmetrical tyres? (or not)
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