What You Need to Know When Selecting Gear Oils
2 #0183;#32;If the VI of the lubricant deviates from this value, additional tables for oils with VI = 120 and 160 are included, or a viscositytemperature plot can be used to interpolate the appropriate ISO viscosity grade. Figure 1. Although several common methods for gear lubricant viscosity grade selection are available, most should return similar values.