Glossary of Terms & Conversion Tables

Viscosity Equivalents

Comparison of ISO/AGMA/SAE Viscosities at 40˚C

Viscosity Equivalents


  • Read horizontally.
  • Equivalence is in terms of viscosity at 40ºC only.
  • Viscosities of SAE engine oils based on a VI of 150, an estimated average of current Passenger Car Motor Oil and Heavy-Duty Engine Oil products.
  • Viscosities of SAE gear oils based on a VI of 130, an estimated average of current Automotive Gear products.
  • Viscosity limits are approximate: for precise data, consult ISO, AGMA and SAE specifications.
  • SAE W grades are represented only in terms of approximate 40°C viscosity. For low temperature limits, consult SAE specifications.