Key Points for Selecting Lubricating Oil

Different types of lubricating oils have distinct physicochemical properties, and this difference leads to variations in the quality of compressor lubricating oils. Currently, synthetic compressor lubricating oils are generally considered superior to mineral oils. Among synthetic compressor lubricating oils, ester oils perform best, followed by ether oils, then hydrocarbon synthetic oils. Silicone oil is most ideal for use as a compressor lubricant under normal conditions, but extra caution is needed under special conditions. It is important to note that regardless of whether it is synthetic oil, semi-synthetic oil, or mineral oil, compressor oil—synthetic oil in particular—has far better compatibility with refrigerants than other types of oils. It can protect the surfaces of parts being lubricated and pose no harm to subsequent processes or equipment. Although synthetic oil is more expensive, its lifespan is significantly longer, and it offers better lubrication performance in many cases. Additionally, in some specific applications, synthetic oil must be used to prevent chemical reactions between the lubricating oil and the compressed gas.