Flo® "Spin-on" Oil Filter - Polished Aluminum - Aprilia/BMW/Buell/H-D/Moto Guzzi/Yamaha - PCS4CFlows 7 times more than paper or synthetic filters while filtering to 35 microns (absolute, 1 pass test). Built in 17 mm drilled hex nut for easy removal and race track safety wire. Bypass valve will not open on cold startups and high RPM. Consistent filtering across the entire surface. Easily cleaned and reused, paying for itself. Provides 10 degrees of cooling power. Unaffected by water, heat or pressure.