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Originally Posted by Tomaz
There are threads implicating the K&N filiers for causing problems with the mass air flow sensor by oil coating it. I would use the OEM paper filter and throw it away when it is dirty.
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Agreed, or the aFe filter:
aFe - High Performance OE replacement air filter for most BMWs
http://www.europeanautosource.com/pr...oducts_id=1115
The aFe filters use a vegetable-based oil that will not leave a film or harm the HFM. Filters are lifetime warranty and reusable.