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The main reason a big rig runs those throw away dry filters is that when it is time for maintenace they do not take the time to wash and clean and dry then oil a filter.. they get turned around and put back on the road..
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Holy Crap, yes. Can you imagine how many hours it would take to clean two dual filters the size what's used on a heavy truck if they were K&Ns?
It takes me way over an hour to clean my little flat pickup size K&N. The cleaner gets the trapped dust/dirt out quick enough, but the bugs, bug wings trapped in the pleats give me fits. I keep an extra in stock so I can stick it in and clean the dirty one when I feel like it.
