FIBER FILTER OIL 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 WATER RESISTANT AND WILL NOT RUN OFF.