Good info thxOiling a filter is a PITA. Over-oiling a filter is easy to do and can lead to MAF sensor issues. For me, it just isn't worth my time. But you'll find plenty of folks that are K&N fanboys.
Watch this YouTube video by Project Farm where he compares an oiled K&N to other brands of normal filters. The K&N didn't perform that well compared to less expensive filters. My Volant Powercore used a Donaldson filter that was good for 50,000 miles.