Calculate Viscosity Index (VI) from kinematic viscosities at 40°C and 100°C per ASTM D2270
Input Parameters
Results
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Viscosity Index
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VI Rating
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Viscosity Ratio
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Temperature Sensitivity
Reference
ASTM D2270 Viscosity Index calculation
VI 100 = standard mineral oil
VI >130 = synthetic or VI-improved
Higher VI = less viscosity change with temperature