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All I know for sure is that I'll never go back to a plain paper filter again in that vehicle and I'll service the K&N at regular intervals far less than what what they recommend, just to be sure.
Here's a rule of thumb for you:
If the filter isn't clogging up, then it ain't filtering.
Some things can be done to improve the situation. The inverted filter like Dodge uses in the Dakota (and I believe most vehicles are moving to) lets most of the dirt fall out before it gets a chance to clog the filter. The 'oiled-foam' filters work by trapping contaminants in a viscous oil on the side of the air passage vs just letting it get stuck in a hole as the paper ones do. Then there is the centrifugal trick where you try to throw the dirt someplace else before it gets sucked into the filter. Other than that, there's not much you can do.
K&N has a reputation for high-flow paper filters. But I've read reports that indicate they get the high flow by letting all the air through (along with all the dirt it's carrying). If you're going to use the K&N, use the oiled-foam type (which I believe you indicated you are), or don't bother unless all your really trying to catch is large oak tree leaves 8*)
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