The diesel filter should be replaced once every 10000 to 20000 km. If it is not replaced for a long time, it is likely to lead to weak engine acceleration, or even damage the fuel injection nozzle, thus affecting the normal operation of the engine. Therefore, it is recommended that the diesel filter be replaced once when the driving mileage reaches about 20000 km.
      
Functions of diesel filter:
The diesel filter can filter out some impurities in the diesel oil, make the pure diesel oil enter the engine, prevent the wear of all parts, and ensure the normal operation of the engine.

How often should diesel engine oil be replaced:
In most cases, diesel vehicles can be replaced every six months or when the mileage reaches about 5000 km. However, in fact, it will be affected by many factors, such as the environment in which diesel vehicles are used. If you usually drive on dusty roads, it is recommended that you replace the oil every 4000 km or so.
In addition, if you want to drive the vehicle for a longer time and change the engine oil more frequently, you can use fully synthetic engine oil with a change cycle of 1 year or 10000 km. At the same time, when changing the engine oil, you can also change the diesel filter element, engine oil grid, air filter and other parts.

In general, the engine can be better protected only if the engine oil is used correctly and certified by the original manufacturer. Otherwise, it is likely to increase the friction of parts, thus damaging the engine and affecting the life of the diesel engine.