K&N Air Filter Oil is the only oil specially formulated to work in combination with the cotton fabric in K&N Filtercharger® elements providing a superior air filtration system. When used as directed, it quickly penetrates the filter pleats, where it remains suspended in the cotton fabric. Saturation is maintained until the element is cleaned with K&N Air Filter Cleaner.

Q: "Which filter do I have? Which kit do I need?"
Below is a photo of two very similar looking filters. In reality, the filter on the left is a dryflow, the one on the right is an oiled filter. Each type requires it's own specific cleaning kit. 

If your filter only says "K&N" at the top, you need the cleaning kit that is on this page including the cleaner bottle and oil bottle. 

If you have a DRYFLOW filter the top will be marked. The kit on this page is NOT the one you need. The filter element may be white, gray, or even red.