Refrigeration Oil 68 is a high performance naphthenic mineral oils specifically manufactured for use in refrigeration and air conditioning compressors when refrigerants other than HFCs are used. They have very low pour points and are compatible with all refrigerants except hydrofluorocarbons (HFCs). Refrigeration Oil 68 is recommended for cylinder and bearing lubrication in reciprocating and rotary refrigeration compressors. They are also recommended for use in air conditioning systems without HFC refrigerants. They can also be used in most other machinery operating at sub-zero temperatures.