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What Is Shear Stability?

The ability of a substance to retain its original properties under shear. The shear stability of lubricating oils represents the property of lubricating oils to maintain a stable viscosity when subjected to mechanical shearing and rolling. Also known as mechanical stability. If the shear stability is good, the lubricating oil can maintain a relatively stable viscosity during mechanical shearing, otherwise the lubricating oil will have a lower viscosity due to shearing.

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