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Old 05-24-2012, 01:52 PM
BM0rri5's Avatar
BM0rri5 BM0rri5 is offline
Location: NE Oklahoma
Join Date: Apr 2011
Posts: 120
Mein Auto: '01 X5 4.4i
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!
Brodie Morris | Morris Racing | Garage

2001 BMW X5 4.4i - Jet Black - Beige Leather - Sports Pkg, Cold Weather Pkg, 20" Aftermarket Wheels
2002 BMW 745i - Sterling Grey Metallic - Black Leather - Convenience Pkg - Sold
1999 Chevrolet Corvette - Arctic White - Tan Leather - Convertible - Sold
2006 Chrysler 300 SRT8 - Silver Steel Metallic - Black Leather - 425HP, Navigation - Sold

Last edited by BM0rri5; 05-24-2012 at 01:56 PM.
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