Imagine filling a beaker with turbine oil and another with a thick gear oil. While the descriptions may seem similar, there are important distinctions between the two.Īn oil’s kinematic viscosity is defined as its resistance to flow and shear due to gravity. But what do we really mean when we talk about an oil’s viscosity?Ī lubricating oil’s viscosity is typically measured and defined in two ways, either based on its kinematic viscosity or its absolute (dynamic) viscosity. It is often one of the first parameters measured by most oil analysis labs because of its importance to oil condition and lubrication. According to the Society of Tribologists and Lubrication Engineers (STLE), viscosity is one of an oil’s most important physical properties.
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