species
　　Centrifugal oil filter has a rotor sleeve on a shaft, and there are two injection direction opposite nozzle, when the oil into the rotor from the nozzle out of the rotor, the rotor will rotate quickly, so that the oil in the rotor body is clean, the impurities in the oil is centrifugal thrown to the inner wall of the rotor, the nozzle out of the oil flow back to the oil sump. Centrifugal oil filter is characterized by stable performance, no need to replace the filter element, as long as the regular removal of the rotor, clean the dirt deposited on the rotor wall can be reused. Its life is comparable to that of an engine. Its disadvantages are complex structure, high price, cumbersome, etc., the user has a high technical requirements.
　　Full flow oil filter, as mentioned before, replaceable, rotary type, split centrifugal type, etc., to filter all oil into the system. The shunt filter only filters 5%-10% of the oil supplied by the oil pump. Shunt oil filters are fine filters, it is generally used in conjunction with the full flow. Most engines with small power only adopt full-flow filter, while diesel engines with large power mostly adopt full-flow plus shunt filter.