This engine oil filter removes particulate from the lubricating oil circuit before the oil reaches the main bearing journals and the turbocharger supply line. It mounts on the engine block and contains a pleated paper medium that traps wear debris and combustion byproducts. A clogged filter restricts oil flow and forces the bypass valve open, which sends unfiltered oil through the engine and accelerates bearing wear. The manufacturer machines the sealing gasket surface and the thread to match the original filter head, so the bypass valve cracks at the correct differential pressure. On installation, lubricate the gasket with clean oil and tighten the canister by hand until the gasket seats, then give an additional three-quarter turn.