Although its name would suggest otherwise, this is not a measurement of the shearing protection an oil provides but instead the viscosity measured under different conditions than the normal kinematic viscosity that can be likened to how the oil will slide over top of itself as opposed to how it flows. In addition to the kinematic viscosity requirements for an SAE grade, there is an accompanying high temperature high shear ( HTHS) viscosity measurement to go along with each grade. At the time of this writing, the SAE currently has six active viscosity grades (60, 50, 40, 30, 20 and 16) with another two (12 and 8) being set for future implementation. This is essentially a measurement of the “thickness” of oil and specific ranges of viscosity correspond to specific SAE viscosity grades. Kinematic viscosity is the main measurement used to differentiate the Society of Automotive Engineers (SAE) various grades of engine oils and gear oils. Although dynamic viscosity is used to measure properties in motorcycle lubricants, the kinematic viscosity is the biggest factor in classifying oils for various motorcycle applications. The second is called the dynamic viscosity and is measured by the resistance oil exerts on an object pushing through it. The first is the kinematic viscosity which is measured by the flowing characteristics of oil. There are two varieties of viscosity in which to measure oil. Oils can range from viscosities as thin as water to viscosities as thick as asphalt, so there is quite a large window of possibilities to work with when formulating lubricants. Viscosity is a measurement of an oil’s ability to flow.
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