Twin Air Pre-Oiled Air Filter Suzuki King Quad 450 / 500 / 750 The Twin Air filter, pre-oiled with biodegradable foam filter oil, holds its superiority in the market. The oil used with these filters was exclusively developed for Twin Air by Chevron Texaco, it has been tested and approved by a highly prestigious German engineering lab, confirming its performance in filtration. Features: Pre-oiled ATV vehicle specific