What does Viscosity Index mean?

  • Viscosity decreases at higher temperatures
  • The viscosity classification on the packaging is at a specific temperature
  • Higher VI means that the oil thickness decreases to a lesser extent than an oil with a lower VI
  • Multigrade oils and synthetic oils have higher VI, therefore they can better withstand changes in viscosity due to temperature
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Fuel Card Engine Oil Motorcycle oil Oil Change Synthetic oil Viscosity Viscosity Index