Motor Oil Info

Viscosity is the most important property of a lubricant in its defense against thermal runaway. Viscosity correlates to film thickness and film strength, which keep moving parts from contacting each other and creating increased friction, heat and wear. The higher the viscosity of a lubricant, the greater protection it provides. However, a lubricant which is too thick is detrimental because it consumes more energy and increases fuel consumption.

The original equipment manufacturer (OEM) determines which viscosity grade is optimum for the specific application. Many gear lubes are formulated with additives called viscosity index (VI) improvers. These additives broaden a lubricant’s operating temperature range and are used to ensure multi-grade viscosity performance for hot and cold temperatures.