METHODS FOR CALCULATING THE VISCOSITY INDEX HYDRAULIC OIL

In this paper viscosity index of hydraulic oil was determined using tree methods. Viscosity index was calculated from the measured viscosity at 40°C and 100°C using ASTM Method D 2270 and was graphically determined using ASTM D 341. Viscosity index calculation was performed with a computer program using kinematics viscosity at 40°C and 100°C. The viscosity-temperature coefficient was calculated from the measured viscosity at 40°C and 100°C.