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.
Air Filter Cleaner and Degreaser is biodegradable. Will not harm paint, chrome, cast aluminum, plastic, rubber, or vinyl when used as directed. Not for use on polished or anodized aluminum. It dissolves dirt build-up and old filter oil, and is easily washed away.