K&N Air Filter Oil K&N Air Filter Oil is engineered specifically to work with K&N cotton air filters, creating an enhanced air filtration system. Its unique formula quickly infiltrates the filter pleats, remaining within the cotton fabric until the air filter is cleaned using K&N Air Filter Cleaner. This specialized oil ensures that air filter saturation is optimally maintained for superior performance. Features: The only oil designed specifically for K&N filters Specially formulated to improve air filter performance Quickly penetrates and saturates the filter pleats Aerosol spray can for convenient spray on use Red coloring to ensure full coverage