lubricating oil is a kind of lubricant with the most extensive use and the largest amount. According to the requirements, it can be divided into high temperature resistance, low temperature resistance, high and low temperature resistance, good abrasion resistance, heavy load, high detergency, good foam resistance, good water separation, good oxygen resistance, long life, good leakage resistance, food grade, biodegradable, etc. According to the type, it can be divided into mineral oil, semi-synthetic, fully synthetic, silicone oil, fluorine oil, etc. According to the application, it can be divided into: hydraulic oil, gear oil, guide rail oil, turbine oil, air compressor oil, refrigerating machine oil, vacuum pump oil, diffusion pump oil, chain oil, metal processing oil, etc.