The engine exhaust emits blue smoke, mainly burning oil. The main reason for the burning of oil is the wear of cylinder liners, pistons, and piston rings, or the oil surface of the sump oil is too high. When this happens, we must pay careful attention to the inspection. First, check if the oil surface of the oil pan is too high. If it is too high, the oil should be lowered to the specified position. If the oil surface is blue smoke within the specified range, the cylinder liner, piston and piston ring must be carefully checked. If these parts exceed the wear limit, they should be replaced in a timely manner, otherwise it will easily lead to poor lubrication, resulting in burning oil tiles or connecting rods, resulting in greater losses. Therefore, the blue smoke of the engine must pay special attention to inspection.