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I believe BMW recommends changing these cabin filters every 15,000 mi (down from 30,000 mi originally). A lot will depends on where you live, and drive. I asked my SA to have the tech change mine at 15,000 and they were pretty cool about it.
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2020 /// M2 Competition
Past: 2016 435i ZHP Edition | 2013 335i | 2011 135i | 2008 328i | 2006 325i
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