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      03-04-2013, 10:57 PM   #11
Fen335i
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Drives: e92 M3 / Z4 M Roadster
Join Date: Jun 2008
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Curious, what's the downside of not changing this once a year? Poor/stagnant smell coming through A/C vents? Poor ventilation/airflow? Reduced life on cabin heating/AC system?
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