Tip & How-To about 2007 BMW 550i Sedan
The microfilter is an electrostatically charged filter that captures dust and pollen particles (down to 5 microns) that normally are drawn into the passenger compartment through the ventilation system. It is similar to the filter that you have in your home AC unit. Just like your house filter your BMW's microfilter should be changed also. The recommended interval is at every inspection #1 and #2. However, if your AC smells musty or you have decreased blower fan volume change it sooner.
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