The normal consumption of diesel engine oil generally accounts for 0.7% to 2.5% of the diesel consumption. If it exceeds this value, it indicates that the diesel engine consumes too much oil. Excessive engine oil consumption is mainly due to three reasons: First, the oil cylinder liner piston group into the combustion chamber; Second, the oil along the gap between the valve and the catheter into the combustion chamber; Third, from the other seal leakage oil. The following measures can reduce the consumption of oil. First, use new energy-saving piston rings, especially oil rings, to increase the scraping power and prevent the oil from entering the combustion chamber. After the cylinder liner is worn, repair it in time. If necessary, replace the cylinder liner, piston ring and piston. Second, often maintain negative or zero pressure in the crankcase to prevent positive pressure. Single-cylinder diesel engines can be equipped with negative pressure valves, and multi-cylinder diesel engines can be equipped with filter-type vents. 3. Replace the valve guide tube after it has worn out to prevent the oil from entering the combustion chamber along the valve stem. Fourth, the use of sealed adhesives, can play the role of sealing, leak-proof, fastening and blocking gaps, to prevent the leakage of oil. If the seal is damaged, replace it in time. Fifth, do regular oil changes. When the engine oil becomes thin or aging loses its lubrication effect, new oil must be replaced in time.