Efficient filter media offers increased dirt-collecting capability and ability to capture more engine-harming particles, Advanced engine protection, Premium gasket included, Anti-drain back valve holds a reserve of oil in the filter to help protect the engine during start-ups, Built for both synthetic and conventional oils, Part Reference Numbers : 84021 S5315 X5315 CH8712 EF15315 CF522 LF522 L15315 57021, Kit Includes: 2x Engine Oil Filter, Kit Variations: K56-100074 K56-100113 K56-100142 K56-100164 K56-100204 K56-100244 K56-100284 K56-100324 K56-100364 K56-100404, Part Reference Numbers : 84021 S5315 X5315 CH8712 EF15315 CF522 LF522 L15315 57021