The oil filter element is the oil filter. The function of the oil filter is to filter out the impurities, colloids and moisture in the oil, and to deliver clean oil to each lubricating part.

In order to reduce the frictional resistance between the relative moving parts in the engine and reduce the wear of the parts, the oil is continuously delivered to the friction surface of each moving part to form a lubricating oil film for lubrication. Engine oil itself contains a certain amount of gum, impurities, moisture and additives. At the same time, during the operation of the engine, the introduction of metal wear debris, the entry of impurities in the air, and the production of oil oxides gradually increase the number of impurities in the engine oil. If the oil is not filtered and directly enters the lubricating oil circuit, the debris contained in the oil will be brought to the friction surface of the moving pair, which will accelerate the wear of parts and reduce the service life of the engine.

Due to the high viscosity of the oil itself and the high content of impurities in the oil, in order to improve the filtration efficiency, the oil filter generally has three levels, namely the oil collector, the coarse oil filter and the fine oil filter. The filter collector is installed in the front oil sump of the oil pump, generally using a metal filter screen. The coarse oil filter is installed behind the oil pump and connected in series with the main oil passage. There are mainly metal scraper type, sawdust filter element type, and microporous filter paper type. Now the microporous filter paper type is mainly used. The fine oil filter is installed behind the oil pump and connected in parallel with the main oil passage. There are mainly two types: microporous filter paper type and rotor type. The rotor-type oil fine filter adopts centrifugal filtration and has no filter element, which effectively solves the contradiction between oil passability and filtration efficiency.

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