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Which outcome occurs when engine oil temperature decreases significantly during cold weather startup?

A)Increased laminar sublayer Reynolds number
B)Elevated oil pump cavitation risk
C)Bypass valve closes prematurely
D)Decreased hydrodynamic lubrication regime

💡 Explanation

Increased oil viscosity from lower temperatures reduces the Reynolds number, promoting turbulent flow, and decreasing the inlet pressure to the pump. Therefore, cavitation is more likely because of vapour formation, rather than stable fluid delivery at the pump inlet.

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