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The basic task of the lubrication system is to continuously supply clean, pressurized and temperatual-appropriate oil to the friction surface of the moving parts so that the engine can work normally. For this reason, the pressure lubrication system must have a sufficient oil pressure oil pump for pressure lubrication and to ensure oil circulation, a container for oil storage (generally using the oil pan to store oil), and a circulating oil circuit composed of a lubricating oil pipe and a series of lubricating oil passages processed on the engine body. The oil circuit must also have a device that limits the maximum oil pressure - a pressure limiting valve, which can be attached to the oil pump or can be set separately.