Certain motor oils exhibit a viscosity increase under high shear stress. This means their resistance to flow becomes greater when subjected to intense forces, such as those experienced in engine components during high-speed operation or under heavy loads. This behavior contrasts with Newtonian fluids, whose viscosity remains constant regardless of shear rate. An example of this phenomenon would be the increased resistance to flow of a specific oil when a rapidly rotating crankshaft subjects it to high shearing forces.
This characteristic offers several advantages. Improved lubrication under extreme conditions is a key benefit, reducing friction and wear on engine parts. This translates to enhanced engine protection, potentially increasing engine lifespan and fuel efficiency. The development of oils exhibiting this property has been driven by advancements in lubricant chemistry and a growing demand for superior engine protection in modern, high-performance engines. Historically, lubricants were largely Newtonian, but the demand for better performance has spurred the development of these specialized fluids.
Further discussion will explore the chemical mechanisms underlying this behavior, various applications of these oils, and comparative analyses of their performance relative to traditional lubricating oils. Specific examples of commercially available products exhibiting this viscosity behavior will also be examined.
