LYE series oil filter machines cannot only remove the carbon particles, deep oxides, etc., but also can filter off the harmful matters such as colloid, bitumen. After treated by the machines, the color of the treated oils looks like the new one, the quality indexes are improved also, so as to resume the performance of engine oil, keep the engine being lubricated, guarantee lubricating system of engine to work properly and prolong service life of engine oil. The series machines are special for recycling kinds of engine oil used in ships, cars and other vehicles.