[cgfitzp]

I have 25 years experiance with oiled filters in the motorcycle world, both 2 stroke and 4 stroke for street and dirt use. They work on dirt bikes, when you remove the filter for service the air intake is clean—clean. Often the air box is so dirty you have to clean it before removing the filter.

That being said excess oil is sucked in and burned in combustion.

The only problem I can see is that oil might cause problems with some sensors in the intake path or the filter has done it's job.

K&N filters often pass more air than OEM filters and require more fuel causing a lean condition. If for some reason like an inoperative sensor, the lean condition isn't adjusted for, you will also get an engine stutter.

If the filter is very dirty it will restrict air flow and cause the engine to stutter.

If the filter is clogged after traveling terrain which wouldn't clog the stock filter it saved you engine from eating all the dirt and is doing it's job.

Chet