Both gasoline filters and diesel filters generally use microporous paper filter elements, which are treated with phenolic resin and made into a folding cylinder, which has the advantages of good passing performance, high filtration efficiency, simple structure, low cost, and easy maintenance.

The filtration mechanism of the filter is basically divided into interception filtration and adsorption filtration. When the filtration efficiency is not high, such as the filtration of particles above 30 microns, the basic particle diameter is larger than the pore size of the filter material, which is a typical interception. Type filtration, but for particles below 5 microns, the diameter is smaller than the pore size of the filter material, which belongs to the adsorption filtration method. The adsorption filtration is mainly used for high-performance diesel filters and used in diesel engines with electronic control common rail systems.

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