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There are many types of synthetic lubricants, which can be divided into seven categories based on their composition: synthetic hydrocarbon oils, including alpha-olefin oligomers, alkylbenzenes, and synthetic naphthenes. They feature a high viscosity index, a low pour point, and low evaporation losses, with a maximum operating temperature of 232°C. Suitable for the production of diesel engine oils, gear oils, hydraulic oils, air compressor oils, refrigeration oils for cold and extremely cold regions, as well as white oils for various applications. Synthetic cycloalkanes have a high traction coefficient and are primarily used as transmission fluids in continuously variable transmission systems. Ester oils, including diesters, polyol esters, and mixed esters, are characterized by a high viscosity index, low evaporation losses, good thermal oxidation stability when additives are added, and the ability to be used over extended periods at temperatures of 175–200°C. They represent a class of synthetic lubricants with excellent performance in all aspects. It is mainly used in the production of various aviation lubricants, internal combustion engine oils, air compressor oils, high-temperature instrument oils, lubricants for metal processing, as well as oils for the textile and synthetic fiber industries. Phosphates include trialkyl, triaryl, and alkylaryl phosphates. It is characterized by flame resistance and good lubricity, but it hydrolyzes easily at high temperatures and can dissolve common rubbers, plastics, and coatings. Primarily used in aviation and industrial flame-retardant hydraulic oils. Silicone oil, also known as siloxane oil, is a polysiloxane liquid with terminated groups. The main chain is composed of alternating silicon and oxygen atoms. It is a colorless, transparent, odorless, and tasteless fluid. They are generally classified into methyl, ethyl, tolyl, and methylchlorobenzyl silicone oils, etc. It is the oil with the best viscosity-temperature properties among various lubricants, possessing excellent electrical insulation and thermal stability, and can be used over a long period at temperatures ranging from -90 to 273°C. Used as a release agent in the plastics, rubber, and food industries ； Used for damping, shock absorption, and as a hydraulic fluid in high-altitude aircraft ； Antifoam agents for various oil-phase and water-phase systems ； It also has a good defoaming effect on fermentation broth, as well as pulmonary fluid and gastric juice. Methyl silicone oil has low viscosity and a high flash point, making it suitable as a flame-retardant transformer oil. **Silicone-based oils have better thermal stability and are widely used as diffusion pump oils. Ethyl silicone oil has better lubricity and compatibility with mineral oils than methyl silicone oil, but its heat resistance is slightly lower. Fluorine oils include perfluorocarbon oils, fluorochlorocarbon oils, and polyperfluoroalkyl ether oils. They have high thermal decomposition temperatures and good chemical stability; they do not react when exposed to concentrated inorganic acids, bases, or strong oxidizing agents at temperatures below 100°C, and they are neither flammable nor explosive in air. Fluorinated oils have significant utility in the defense industry, and in the chemical industry they are used in lubrication applications that are exposed to acids, alkalis, liquid oxygen, and various chemical agents. Polyalkylene ether oils, also known as polyethers, include diols, monoethers, and dioethers. It has good lubricity, and no precipitates or gels are formed after high-temperature oxidation. It is mainly used as an automotive brake fluid, a component in water-ethylene glycol resistant fuels, a quenching and cutting fluid for metal processing, and a lubricant for high-temperature applications. In addition, there are other synthetic oils such as polyphenylene oxide and triazine, which are rarely used due to their difficult production and high cost.