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Which outcome results when lubricating oil viscosity drops within engine cylinders?

A)Increased frictional wear on piston rings
B)Enhanced heat transfer from combustion
C)Reduced fuel consumption from lower drag
D)Improved sealing and higher compression

💡 Explanation

Increased frictional wear results from reduced lubricant film thickness because viscosity reduction permits greater metallic contact. Therefore, wear increases, rather than decreasing fuel consumption or improving sealing, because hydrodynamic lubrication fails at lower viscosities conditions.

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