Basic working principle of oil filter
The oil extracted from the oil pan by the oil pump enters the surface of the filter cartridge at a certain pressure (0.3-0.4 Mpa) from the oil inlet of the filter (multiple punched holes on the threaded cover plate), enters the central pipe after being filtered by the filter cartridge, and then flows into the main oil channel of the engine through the oil outlet (i.e. the central threaded hole) for lubrication. When the engine is cold started or the filter element is blocked, causing an increase in oil resistance, the pressure of the oil will overcome the pressure of the bypass valve spring and be opened, and the oil will directly enter the main oil passage from this valve to ensure timely lubrication.
Therefore, after driving a certain mileage, the engine oil filter needs to be replaced. If it is not replaced or delayed, it will affect the performance of the car, leading to poor fuel flow, poor refueling, and ultimately leading to chronic damage to the engine, and even major engine repairs.
How often is it best to change the oil filter?
The replacement cycle of automotive oil filters is generally around 10000 kilometers, and the specific optimal replacement time can refer to the instructions in the vehicle manual. Usually, the replacement of the fuel filter is carried out during major maintenance of the car, along with the replacement of the air filter and oil filter.