Which PAG Should I Buy?

Ordinary PAG is still chemically active, while “end-capped” PAG is chemically inactive and stable. It will not react with heat or moisture to form harmful acids. In many cases, you can look for a double “end-capped” formula of PAG that matches the viscosity recommended for use with your compressor. However, when in doubt, always check with the compressor manufacturer and then use the PAG it suggests.