How crucial is it that you oil an air filter. I have a K&N cone filter on a short ram. When i got the filter it was pre oiled. It looks a bit dirty now so i was just going to rinse it off. DO i really need to oil it?

 

Yes, it needs to be oiled to help stop the dirt. When I had K & N filters, I just used 409 and water to clean it, let it dry, then sprayed the K & N oil.