Doprayat hybrid systems of oil because it can draw power from an electric motor used to propel the engine doesn't have to work very hard (load of the engine is reduced more than half) over, thus reducing fuel consumption.
The hybrid fuel system. It can draw power from the electric motor to assist in driving the engine does not have to work so much harder (less than half the load of the engine), thereby reducing excess oil.
Ford's hybrid system Because can draw power from the electric motor to assist in driving the engine not working very hard (load of the engine fell by more than half.) over the use of oil .