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Old 03-23-2013, 02:56 AM
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MMME30W MMME30W is offline
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Join Date: Jul 2003
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Mein Auto: 2009 W906
Hi, not sure specifically about X5s, but assuming they are like all the other BMWs I've owned, the air filter is used to filter engine air. The microfilter, also known as the cabin microfilter, sits in the engine compartment near the firewall upper, and filters the air coming into the passenger cabin.

Does that help?
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