I think I am in on this as well. I haven't comfirmed it yet 100% but about 90% sure I have some slight knocking coming from the rack bushings. I have rebuilt a few racks(not BMW) years ago, and do remember that getting parts can be an issue. For sure compensating for wear by adjusting the preload is not a good idea.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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