I noticed some new airfilters out there by fram, the "airhog". They seem to be a 'high perforamce' filter to rival that of K&N, I saw no indicition of it being an oil type air filter, but can't help wonder if it is.
fram's website says
“Motorists simply check it once a year and use the FRAM AirHog Air Filter Cleaner if it needs cleaning. Before re-installing the filter, FRAM AirHog Air Filter Oil should be applied to improve the efficient filtering of contaminants.”