This engine oil filter removes contaminants from the lubricating oil before it circulates through the engine's bearing surfaces and oil galleries. It mounts to the engine block and receives oil from the pump; trapped particles protect the crankshaft, connecting rods, and valve train from abrasive wear. A restricted filter element forces the bypass valve open, allowing unfiltered oil to reach the engine, which accelerates internal wear. The manufacturer machines the sealing face and thread to match the original housing, ensuring the bypass valve seats correctly and the gasket seals without leaks. Replace the filter at the interval specified in the engine service schedule.