The installed filter element is not in place or due to poor quality of the installed filter element itself.
The installed filter element is not in place or due to poor quality of the installed filter element itself, resulting in poor atomization of the fuel injector pressure; Excessive wear on the high-pressure pump; Poor combustion caused by insufficient cylinder pressure; The filter cloth of the air filter is not smooth; High horsepower and long ignition time. Diesel engine oil consumption is caused by piston ring wear or piston ring alignment. Alternatively, the cylinder wall may be severely worn with a large gap between the cylinder walls.

Reason for replacing the filter element
This is mainly because the high-precision components of the diesel engine's fuel supply system have higher quality requirements than diesel. The compression ratio of diesel engines is higher than that of gasoline engines, and the working environment is also worse than gasoline engines. The load borne by the crankshaft and connecting rods is also much greater than that of gasoline engines. Moreover, most diesel engines have more oil filters than gasoline engines due to their harsh operating conditions.
One or two thousand kilometers is for cleaning, and even after cleaning, it is still very dirty before replacing it. The cleaning method is to first shake it on the ground, shake the dust off, and then use high-pressure air to blow it. If the blow cannot clean it completely, it can only be replaced. After the very dirty air filter is blocked by dust, the amount of fresh air entering the cylinder decreases, causing insufficient combustion in the cylinder and not reaching the horsepower you need, so you will increase the throttle, resulting in fuel consumption.