Papasmurf, are you aware of the counterfeit Mann filters that were distributed through national US auto parts chains up through 2011? Mann shut down the factory and issued press releases with warnings. Might be worth looking into.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue