When temperature increases, the lubricant becomes thinner and the viscosity becomes lower. Viscosity changes based on load and temperature. When oil is heated its viscosity is reduced, this reduces its load carrying capacity. Lubricants are able to do this by forming a physical barrier between moving parts. They reduce friction, surface fatigue, heat, noise and vibrations. Lubricants are typically used to separate moving parts in a system. High Viscosity oils have molecules with greater cohesion ability (Higher resistance to flow) were as low viscosity oils have lower cohesion ability (Low resistance to flow) allowing faster flow rates to occur. Viscosity is defined as being equal to shear stress/ shear rate. Viscosity is a measurement of the internal cohesiveness of an oil, better known as its resistance to flow. An important quality of a lubricant is its Viscosity.
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