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← TechnologyWhich outcome occurs when lubricating oil thins excessively between piston and cylinder wall under high thermal load conditions?
A)Increased blow-by gas accumulation✓
B)Enhanced fuel-air mixing occurs
C)Volumetric efficiency increases slightly
D)Reduced surface finish degradation
💡 Explanation
Increased blow-by occurs due to reduced sealing around the piston, because decreased oil viscosity weakens the hydrodynamic lubrication mechanism. Therefore, more combustion gases leak past the piston rings, rather than maintaining adequate compression in the combustion chamber.
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