Refrigerant Compressor Oils are general-purpose, light-duty, petroleum-based solutions that are wax and moisture-free and are commonly used for lubricating refrigeration system compressors. PSC's Refrigerant Compressor fluids satisfy the performance requirements of original equipment manufacturers that specify the need for a naphthenic mineral oil. Naphthenic base oil basically means that this oil has very little to no wax content which provides better low temperature flow capabilities. Refrigerant Compressor Oils are applicable in a wide range of applications including refrigeration systems using ammonia or carbon dioxide as well as plain or rolling bearings. ISO VG 68 oils have a midpoint kinematic viscosity of 68 mm2/s, also referred to as centistokes (cSt). The midpoint is derived by taking the average of both the minimum and maximum kinematic viscosities. In the case of ISO VG 68 oil (also AGMA 2 oil), those numbers are 61.2 cSt and 74.8 cSt, respectively. These numbers refer to the standard testing mechanisms used to determine how much resistance to flow (i.e. viscosity) these oils demonstrate.