The material and design of oil filter cartridges vary, but most of them use a multi-layer filter paper or metal mesh structure to improve filtration efficiency and durability. These filters are typically designed as replaceable components so that they can be easily replaced during oil change cycles, thereby maintaining the cleanliness and efficient operation of the engine interior.

The oil filter element is located in the engine lubrication system, and its main function is to filter harmful substances such as impurities, metal debris, sludge, and carbon deposits in the engine oil, ensuring the cleanliness of the engine oil. When the engine oil circulates inside the engine, it passes through the oil filter element. The filter paper or mesh inside the filter element can block these pollutants, allowing only clean oil to pass through and continue to provide lubrication and cooling for various engine components.