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Which outcome occurs when lubricant viscosity drops excessively in an automotive engine?

A)Increased friction and component wear
B)Reduced fuel consumption averages slightly
C)Enhanced heat dissipation from block
D)Lower exhaust emissions of hydrocarbons

💡 Explanation

Increased friction and component wear result from reduced viscous lubrication because the mechanism, hydrodynamic lubrication, depends on viscosity maintaining a separating film. Therefore the rise in friction is the consequence, rather than reduced fuel consumption under normal operation.

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