If you do not pay attention to the maintenance of the engine lubrication system, you will cause accidental damage to the machine. Insufficient oil supply and poor oil supply will result in poor lubrication and rapid wear of machine parts. It will burn crankshaft, connecting rod bearing and piston seriously. For a long time, the oil and filter are not replaced. The oil is too dirty and the oil in the oil pool contains too much impurities. It will accumulate on the net of the oil collection, so that the oil can not be circulated smoothly. It will also cause serious consequences, and may even cause the engine to be discarded.