![]() ![]() The High-Temperature Low Shear True Basic Rotational Simulator Viscometer (HTLS-TBR) instrument measures the true viscosity (dynamic) and not a combined viscosity-density value (kinematic). There are two effective test instrument types used to determine temporary viscosity loss, the HTLS-TBR and HTHS-TBS. This happens due to increased vulnerability as the thermal, mechanical, and chemical interactions take place. However, if the polymers are stretched beyond their ability to accommodate the motion of the oil, they will undergo permanent viscosity loss or PVL.¹ Both types of loss may negatively impact the engine. This type of loss is due to the deformation and rotation of the polymers under the influence of shear forces (Temporary Viscosity Loss or TVL). ![]() Most multi-grade engine oils are non-Newtonian and their viscosity decreases with an increase in shear stress and, in the case of temporary loss, the oil returns towards its original value and bounces back as the shear stress is reduced. This article focuses on temporary viscosity loss. ![]()
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