How does an oil filter work?

The oil filter's operating principle is this: as impurities accumulate on the filter paper, the filter's permeability decreases, and flow resistance increases, causing the oil pressure outside the filter paper to rise. When the oil pressure is high enough to open the bypass valve, the oil no longer passes through the filter paper and flows directly through the bypass valve into the center tube. From there, it enters the engine's lubrication system through the oil outlet in the center of the oil filter's base plate. The oil filter's primary function is to filter out most impurities from the oil, ensuring its cleanliness and extending its service life. Furthermore, an oil filter should offer strong filtering capacity, low flow resistance, and a long service life.