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  Oil filter is used in the oil from the oil pan to filter out harmful impurities, to clean the oil supply crankshaft, connecting rod, piston, camshaft and supercharger, lubrication, cooling and cleaning effect, so as to prolong the life of these parts.
  To reduce the friction resistance between relative motion in the engine parts, reduce the wear parts, engine oil has been transported to the moving parts of friction surface, forming oil film, for lubrication. The oil itself contains a certain amount of colloid, impurities, moisture and additives. In engine working process at the same time, the metal abrasive dust into, into the impurities in the air, oil oxide production, make the impurities in the oil. If the oil is not filtered, directly into lubricating oil, the oil will be found in debris into motion pair of friction surface, speed up the process of wear parts, reduce the service life of the engine.
  Impurities in the oil, because of the large oil viscosity itself content is higher, to improve the efficiency of filtration, oil filter generally have a level 3, respectively, the oil filter, oil filter and oil filter. Set filter is installed in front of the oil pump in the oil sump, general use a metal mesh type. Oil strainer is installed in the back of the oil pump, and the main oil series, mainly metal scraping plate, sawdust filter, microporous filter paper, now mainly adopts microporous filter paper type. Oil fine filter is installed after the oil pump and main oil passage in parallel, there are mainly microporous filter paper type and rotor type two kinds. Rotor type engine oil filter USES centrifugal filtration, no filter, can effectively solve the oil through sex and the contradiction between the filtration efficiency.