![]() ![]() Gravity causes the sample to flow through the tube. Selection of the optimum fluid viscosity grade will provide the most efficient machine performance at standard operating temperatures, therefore minimizing lost time and energy and fuel costs for the operator.Ī predetermined volume of lubricant is introduced into the viscometer tube. As oil temperature increases, viscosity decreases, resulting in lower volumetric efficiency, overheating, and wear. At low temperature, excessive viscosity may result in poor mechanical efficiency, difficulty in starting, and wear. It is an important criterion in the selection of a fluid. It is the measure of the oil’s resistance to flow (shear stress) under certain conditions. The single most important property of a lubricant is its viscosity. This test is a measurement of a lubricant's resistance to flow at a specific temperature ![]()
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