Servo friz ECO series of oils are made for standard factory fill of air conditioning and industrial refrigeration equipment, as well as for OEM retrofiServofriz ECO oils are ester based environment friendly, fully synthetic refrigeration oils designed specifically for lubrication of refrigeration compressors and systems using ozone friendly HFC refrigerants. These are miscible with R 134a refrigerants. Provide improved lubricity and wear protection. Recommended for use in domestic refrigeration, air conditioning and industrial refrigeration systems using HFCs as refrigerants. tting operations.