The price of diesel filter is about 60 to 100 yuan:
1. Function: The function of the diesel filter is to filter out harmful impurities and moisture in the fuel system, protect the normal operation of the engine, reduce wear, avoid blockage, and improve engine life;
2. Material: The filter element of the diesel filter is mostly made of filter paper, and some of it is made of felt or polymer material. The filter element of the gasoline filter mostly uses filter paper, and some also use nylon cloth and polymer materials;
3. Structure: The structure of the diesel filter is roughly the same as that of the oil filter, and there are replaceable and spin-on types.

The role of car oil filter:
1. The car oil filter is located in the engine lubrication system. Its upstream is the oil pump, and the downstream is the various parts in the engine that need to be lubricated.
2. The function of the machine filter is to filter out the harmful impurities in the oil from the oil pan, and supply the crankshaft, connecting rod, camshaft, supercharger, piston ring and other moving pairs with clean oil, which plays the role of lubrication, cooling and cleaning.
3. 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 transported to the friction surface of each moving part to form a lubricating oil film for lubrication.