Re: K & N air filters: The cleaner stuff is very similar to Formula 409. My local FLAPS sold me both the cleaner and the oil for $10.95. No new K & N air filter I have ever seen is pre-oiled. The oil is red so you can tell if you've completely covered the entire surface area. YMMV. Dennis Culligan, Highland NY / 1976 TR6 CF57948U