Lubricating oils suitable for rotary screw and rotary vane air compressors must have the functions of lubrication, cooling, protection and sealing. As far as lubrication is concerned, lubricants with a viscosity grade between 32 and 100 are usually recommended on rotary air compressors, and the viscosity should be higher. Lubricating oil must have good oxidation resistance, good corrosion resistance, good anti-foaming properties, good water separation properties, and high flash point. There are many brands of lubricants for rotary air compressors on the market, which can be divided into mineral oil, semi-synthetic oil, fully synthetic oil, and fully synthetic oil is divided into PAO (synthetic hydrocarbon), PAG (polyether polyester), silicone oil ( Sullair 24KT). In the process of after-sales service, different types of lubricants should be selected for rotary air compressors that need to be operated according to different models and different working conditions. 1) First of all, choose the same type of lubricating oil as the initial oil to avoid mixing oil products, which may easily cause risks such as coking and carbon deposition. 2) For air compressors with large displacement, use fully synthetic lubricating oil (PAO, PAG) as much as possible. Synthetic oil has a long service life, and the oil is not easy to coke and carbon deposits. It has strong high temperature resistance and can generally operate at around 100 degrees. The large-displacement air compressors of major international brands all use fully synthetic lubricating oil, and the large-displacement air compressors of some domestic brands have already used fully synthetic lubricating oil. For example, Atlas uses PAO, Ingersoll Rand and Sullair use PAG. 3) The exhaust temperature is high. I recommend using PAG or silicone oil when the exhaust temperature is above 100 degrees. PAG is an air compressor lubricant that never cokes and carbon deposits, and can run for a long time at 110 or less. 4) The exhaust temperature of small displacement air compressor is about 90 degrees, and the oil change time is about 3000 hours. Mineral oil can be selected. The exhaust temperature is within 100 degrees, and the oil change time is about 5000 hours. Semi-synthetic oil can be used. 5) For low-speed air compressors or air compressors for overhauling and grinding rotors, lubricating oil with high viscosity (No. 46 or No. 68) and high viscosity index should be used to increase its sealing performance and ensure the displacement. 6) Lubricating oil for air compressors with low viscosity (No. 32) and high viscosity index should be selected for high speed and single screw. Such as Kobelco, Hitachi, and single screw. 7) Air compressors with variable frequency and low loading rate should use oil with good water separation. When operating at low frequency and low loading rate, the exhaust temperature is low, water is not easy to evaporate, and oil is easy to emulsify. 8) Mobile and mining air compressors should use lubricating oil with a wide range of temperature and use. The service time is generally about 3000 hours, and the oil is easily polluted by dust.    

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