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Which effect increases when lubricating oil viscosity sharply decreases within a high-speed gearbox?

A)Increased surface roughness degradation
B)Enhanced hydrodynamic film thickness
C)Reduced adhesive wear dominance
D)Improved scuffing load capacity

💡 Explanation

Decreased viscosity reduces the lubricant's ability to maintain a separating film, which causes increased surface roughness degradation because boundary lubrication mechanisms dominate, therefore contact increases, rather than beneficial full-film lubrication regimes occurring under normal viscosity.

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