The most technologically advanced R134a and R12 oil on the market today. One oil for all applications. Can be added to any existing R12 or R134a mobile A/C system with Mineral, PAG, Paraffin, or Ester Oil. Use to replace PAG, Mineral, or Paraffin Oil. Prevents acid from forming and inhibits corrosion. An all natural Ester oil, that contains additives which give it the ability to lubricate and protect the system at the same time. Compatible with mineral, Ester, Paraffin, and PAG Oil.