There are sure a lot of people worried about putting too much oil on it after they clean it. If you follow the instructions, I don't know how you could over oil it. With the cleaning kit that I now have, I've used it 5 times and still have plenty of cleaner and oil left to do it probably 5 more times. On one of my cars I've gotten a 2 MPG increase and that adds up to 32 extra miles per tank. With gas at $3 a gallon it only takes a couple of months to pay for the filter and cleaning kit. Someone made the comment that they don't see how you could save money by using a K&N. You'd have to be blind to not be able to see it. As far as the recommended interval for cleaning goes, I do mine every 20 to 30 thousand miles. A couple of weeks ago I checked the one in my GT which has 19000 on it and there was no need to clean it. It was still almost as clean as the day I put it in there. | 
