Stephen, I've cleaned and re-oiled my K&N filter using their kit. Spray on the cleaner, let soak, rinse off with water. Don't use compressed air but let the filter thoroughly dry and then spray with the included
oil. The kit contains plenty of both cleaner and
oil to do the filter several times. My filter does have the instructions on it to
oil before using but mine came pre-oiled. If the filter element is reddish color, its already oiled.