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While the two numbers specify the SAE viscosity grade, the viscosity index shows the temperature related change of viscosity. This page gives an overview of the oil specifications, see also the measurement data of engine oils and gear oils over a wide temperature range.
The Society of Automotive Engineers (SAE) set parameters for multigrade oils and viscosities base upon cold cranking viscosity, pumpability and cST measured at operating temperature. The table below shows these requirements. Permanent Vs Temporary Shear.
Find viscosity tables and charts for engine oil at multiple temperatures (viscosity and density values with their source).
KINEMATIC VISCOSITY, CENTISTOKES TEMPERATURE, DEGREES CELSIUS-20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 OIL VISCOSITY / TEMPERATURE CHART Lines shown indicate oils ISO grade Viscosity Index of 100. Lower V.I. oils will have a steeper slope. Higher V.I. oils will have a flatter slope. ISO 1500 ISO 1000 ISO 680 ISO 460 ISO ...
Any mineral oil is supplied with the specification of kinematic viscosity values at two different temperatures, usually at 40°C and at 100°C (or at 100°F and at 210°F). These data is enough to determine kinematic viscosity at any other values of temperature and as well Viscosity Index.
Convert your oils between standards. Several organizations (ISO, SAE, AGMA) have created competing standards to define oil viscosity ranges, but most of them mean the same thing. Oils grades that are on the same horizontal line (with the correct Viscosity Index) on the chart are equivalent.
Dynamic (Absolute) Viscosity - Converting Chart Convert dynamic viscosity values between units like Poiseuille - Poise - centiPoise and more. Engine & Gear Oil - Recommended Viscosity vs. Outside Temperature
