Lab glossary
Viscosity index (VI)
A number calculated from kinematic viscosities at 40 °C and 100 °C (ASTM D2270) that shows how much an oil's viscosity changes with temperature. A higher VI means a smaller change.
- Also: VI
A number calculated from kinematic viscosities at 40 °C and 100 °C (ASTM D2270) that shows how much an oil's viscosity changes with temperature. A higher VI means a smaller change.