Generally speaking, it is recommended to change the air filter of diesel vehicle when it is 5000 to 10000 kilometers: 
1. The engine must suck in a large amount of air during the working process. If the air is not filtered, the dust suspended in the air is sucked into the cylinder, and the air filter will accelerate the wear of the piston group and the cylinder. Larger particles entering between the piston and the cylinder will cause serious "cylinder pull" phenomenon, which is especially serious in a dry and sandy working environment;
2. The air filter is installed in front of the carburetor or the air intake pipe to filter out dust and sand particles in the air and ensure that sufficient and clean air enters the cylinder. Among the thousands of parts and components of a car, the air filter is an extremely inconspicuous component. Because it is not directly related to the technical performance of the car, but in the actual use of the car, the air filter has a great impact on the service life of the car, especially the engine;
3. If there is no filtering effect of the air filter, the engine will inhale a large amount of air containing dust and particles, which will cause serious abrasion of the engine cylinder. If it is not maintained for a long time during use, the filter element of the air cleaner will be filled with dust in the air, which will not only reduce the filtering capacity, but also hinder the circulation of air, causing the mixture to be too thick and causing the engine to work abnormally.