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← ScienceWhich 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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