Pressure-relief valves help minimize the chance of contaminated oil circulating back into the engine, Pressure-relief valves also help maintain the supply of oil to the engine under extreme cold conditions or if the filter gets clogged, Steel cases are "ironed" for a precise fit, fluted to ease removal and painted to resist rust, Efficient filter media offers increased dirt-collecting capability and ability to capture more engine-harming particles, Provided with anti-drain back valve, Part Reference Numbers : PF13 PF1766 85355 S5401 X5401 PH8994 OF25401 LF477 PZ65 L25401 AT8994 FP8994 LP8994 T56 VO93 51355

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