For general purpose lubrication and excellent rust resistance, mineral-based rust and oxidation oils are some of the best lubricants to have in your arsenal. Aside from the many usages including the lubrication of compressors, geared turbines, circulation systems, and certain industrial applications, mineral-based R&O bearing oils are designed to provide excellent lubrication to rolling-element and plain bearings in machine tools.
ISO VG 220 oil has a midpoint kinematic viscosity of 220 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 220 oil, those numbers are 198 cSt and 242 cSt, respectively. These numbers refer to the standard testing mechanisms used to determine how much resistance to flow (i.e. viscosity) these oils demonstrate.
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