Thanks Andrew, I will swap the filter out. Any idea where the power steering pump is located? Facing the vehicle the noise is rather coming from around the left bottom. Just saw that the pump also is a large expense... not including labor.

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LEV
2011 X5 xDrive50 Black/black////M sport pack/all options
2006 ///M3 Cabrio Gone but not forgotten
2003.5 ///M3 Gone but not forgotten
2007 Aston Martin V8V Gone but not forgotten
2007 Porsche turbo Gone but not forgotten
1995 540i M-sport(1 of 70) Gone but not forgotten