Axle gear oils: Tribological characterization under full film lubrication

The product formulation and the measured properties promote significant differences under full film lubrication. The film thickness is directly related with the Lubricant Parameter while the traction coefficient depends on the base oil and it decreases with the increase of Viscosity Index and the decrease of Piezoviscosity. So, new lubricants with lower viscosity but holding high VI and low Piezoviscosity are promising for this application.