Compressor Oils that are mineral-based are refined from petroleum base fluids to achieve mild wear protection for use in air compressors, certain geared turbines, lightly loaded gearboxes, and general lubrication purposes throughout industrial plants.
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.