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Old 05-24-2012, 01:52 PM
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BM0rri5 BM0rri5 is offline
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Location: Tulsa, OK
 
Join Date: Apr 2011
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Mein Auto: 2009 BWM 750Li
I have an '01 X5 4.4i with 107k and it makes the hard knocking sound as well, it also did it when I first bought it with 97k.
I've read that it has something to do with Vanos (automobile variable valve timing technology developed by BMW).

Changing the oil and adding a bottle of Lucas helped it. Didn't take the knock away fully, but definitely helped.
Hope this helps!
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Last edited by BM0rri5; 05-24-2012 at 01:56 PM.
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