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Which failure most likely results from piston ring blow-by in a diesel engine, where insufficient cylinder pressure exists during combustion events?

A)Increased lubricating oil contamination
B)Overheating exhaust valve failure
C)Decreased fuel injector efficiency
D)Elevated coolant system pressures

💡 Explanation

Oil contamination is likely because *blow-by* allows high-pressure combustion gases flow past the piston rings contaminating the crankcase oil. Therefore, oil degrades and leads to premature engine wear, rather than exhaust valves overheating, or affecting injectors or coolant pressure directly.

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