It's dusty and dirty here in Texas so I have done it every 5000. They say it can go the whole 15000 and change it when you do your 15000 mile oil service, but I don't belive it. I take it out and look at it and you can see lots of crap on it after only 5k. I do this to keep dust out of the intereior and to elimate that moldy odor you get from dirty microfilters. It makes a difference.
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