I just ordered the Mahle/Clevite fresh air filters and the Denso recirculation filter from Rock Auto. I also ordered the VDO HVAC blower motor as mine is making noise and seizing periodically. As stated above, they just fall into the periodic services and are not monitored or reported by the iDrive system.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim