Bel-Ray Foam Filter Oil provides the highest levels of engine protection and fast drying for more convenient maintenance. Bel-Ray’s innovative technology creates a highly tacky barrier for superior filtration without restricting air flow. High dirt holding capacity requires less frequent filter cleaning than with inferior oils. Bel-Ray Foam Filter Oil is able to trap micron-sized, airborne particles that can cause engine damage and still performs exceptionally well in the dustiest environments. Bel-Ray Foam Filter Oil is fast-drying which makes it quick and easy to apply. Because it is 100% waterproof it will not wash off, clog or gum up when the filter gets wet.