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Air filters get BETTER with time... As long as they are not blocked, they shouldn't be swapped.
 

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We were on about the cabin filter, which will allow all sorts of particles through when new... As it gets used the larger holes get plugged, and so the "mesh" gets smaller and smaller making a better filter, until it's clogged... Then it's useless !
 
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Super Moderator
Joined
599 Posts
I'm at a loss, all my life have had the understanding that a new filter is at its best point when it comes to filtering air.... and and time passes by it's less effective cuz it losses its ability to filter. So as long it doesn't get super clogged (blocked) I can stick with one filter for the rest of my life? D:
If it's not blocked, why would you change it ?
Yes, efficiency will drop over time... And I wouldn't apply the theorum to engine filters (although K&N filters never got changed!)
It's as daft as changing your bulbs regularly in my opinion 馃槈
 
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