Filter, acts on the filtration of impurities. Generally divided into oil filters, fuel filters, air filters, air conditioning filters and so on. Fuel filters are divided into diesel filters, gasoline filters, oil-water separators, hydraulic filters.

Fuel filter maintenance
The fuel filter is connected in series to the pipe between the oil pump and the throttle body inlet.
The function of the fuel filter is to remove solid debris such as iron oxide and dust contained in the fuel to prevent the fuel system from clogging (especially the fuel nozzle). Reduce mechanical wear, ensure stable engine operation and improve reliability.
The structure of the fuel oil is composed of an aluminum shell and a bracket with stainless steel, and the bracket is composed of high efficiency filter paper, and the filter paper is chrysanthemum-shaped to increase the circulation area.
The EFI filter cannot be used in common with the chemical oil filter. Because the EFI filter often withstand 200-300kpa fuel pressure, the pressure strength of the filter is generally required to reach more than 500KPA, and the oil filter is not necessary to achieve such a high pressure.
Fuel filters must be replaced every 30,000 kilometers. If the fuel contains large impurity mass, the driving distance is shortened accordingly. The arrow of the fuel filter housing indicates the direction of fuel flow, and when installing the fuel filter, loading is not allowed. It must be replaced even if it works for a short time in the installed state.

Air filter maintenance
Air filter, located on the right side of the engine compartment of the car. Gently break the metal clip towards the rear of the car, you can break the entire empty filter box cover towards the front, take out the filter element to clean up.
The air filter should be cleaned every one to three months according to the use environment or after a long sand and dust road. Remove the air filter element and knock out the dust, blow it with a high-pressure air nozzle (be careful not to get too close, or use a bicycle air pump, or use a soft brush). And blow out the intake box. Air filter should not be washed; There should be no moisture in the intake box; Old air filter element must be replaced.
Be sure to remember the process when dismantling, installation should be very smooth, if not, should find out the reason to continue, do not use brute force. If you can't handle the truth, you can not install the filter element first, as long as you take out the odds and ends in the box, cover it back, and drive to the repair shop.

Oil filter maintenance
During the use of internal combustion engine, dust metal scraps, carbon and other mechanical impurities continue to mix into the oil, while the oxidation of air and combustion exhaust gas on the oil, will also make the oil gradually produce gum, mechanical debris and gum mixed will also form sludge, which will not only accelerate the wear of moving parts, but also easily cause oil circuit blockage. To ensure the cleanliness of the oil, the engine is equipped with an oil filter in the lubrication system.
At present, the engine of most cars uses a rotary oil filter, which is a disposable filter that can not be removed and washed, otherwise it will affect the quality of the lubricating oil.