The function of oil filter is to filter out sundries, gums and water in engine oil and deliver clean engine oil to all lubricating parts.
In order to reduce the frictional resistance between relative moving parts in the engine and reduce the wear of parts, oil is continuously transported to the friction surfaces of each moving part, forming a lubricating oil film for lubrication. The engine oil itself contains a certain amount of gum, impurities, moisture, and additives. During the operation of the engine, the introduction of metal debris, the entry of impurities in the air, and the generation of oil oxides gradually increase the amount of impurities in the engine oil. If the engine oil enters the lubricating oil circuit without being filtered, it will bring the impurities contained in the oil into the friction surface of the motion pair, accelerate the wear of parts, and reduce the service life of the engine.

Working principle of oil filter element
During the operation of the engine, metal debris, dust, oxidized carbon deposits and colloidal deposits at high temperatures, water, etc. constantly mix with lubricating oil. The function of the engine oil filter is to filter out these mechanical impurities and gums, ensure the cleanliness of the lubricating oil, and extend its service life. The oil filter element should have strong filtering ability, low flow resistance, and long service life.