AC Compressor Oil. Compressors are like your engine, oil is required to stop it from seizing up. make sure PAG 100 is the oil for your system. We can also supply PAG46
PAG oil is to be used with R134A Refrigerant. The type of PAG is determined by the Compressor manufacturer. Never mix oils. Each time a system is recharged, or a component is replaced a small amount of oil is removed from the system.