The role of the car filter is to filter impurities or gas. Automotive filters have high filtering performance and high cleaning effect; long life span and large capture capacity; durable vibration, high durability, and will not cause dust leakage; water resistance, will not block the entry of air, and simple and lightweight loading and unloading. 

The following is the classification of car filters:

1. Air filter. The air filter is installed in front of the carburetor or intake pipe to filter out dust and sand particles in the air, ensuring sufficient and clean air enters the cylinder;
2. Oil filter. The oil filter is located in the engine lubrication system. Its function is to filter out harmful impurities in the oil from the oil pan and supply clean oil to the crankshaft, connecting rod, camshaft, supercharger, and piston. Rings and other moving parts play the role of lubrication, cooling and cleaning, thereby prolonging the life of these parts;
3. Air-conditioning filter, commonly known as pollen filter, the function of automobile air-conditioning filter is to filter the air that enters the cabin from the outside to improve the cleanliness of the air;
4. Fuel filter, its function is to filter out harmful particles and water in the engine fuel gas system to protect the fuel pump nozzle, cylinder liner, piston ring, etc., reduce wear and avoid clogging. Filter out the iron oxide contained in the fuel.