Bel-Ray Foam Filter Oil's new and improved formula is ultra-viscous for the highest levels of engine protection and fast-drying for more convenient maintenance. Bel-Ray's innovative technology has created a far more viscous formula than any other foam filter oil on the market. It creates a highly tacky barrier for superior filtration without restricting air flow. Able to trap micron-sized, airborne particles that can cause engine damage and performs exceptionally well in dusty environments. Bel-Ray Foam Filter Oil's improved fast-drying formula makes it quick and easy to apply, and because it is waterproof it will not wash off, clog or gum up when the filter gets wet. Delivers all of the performance benefits of Bel-Ray's pour type oil in an environmentally friendly aerosol package. It is an easy-to-use product that allows users to effortlessly apply the product to the filter for complete filter coverage. Formulated using the newest delivery system technology and is free of ozone depleting CFCs.