Bel-Ray® Fiber Filter Oil is an aerosol lubricant that was specifically developed for superior performance with all fiber/gauze type air filters. Bel-Ray Fiber Filter Oil is the superior trapping element needed to obtain maximum efficiency from today’s fiber/gauze type air filters. It traps and holds contaminants, will not gum or clog, and does not restrict air flow. Bel-Ray Fiber Filter Oil is a water resistant lubricant and will not run off.