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Which phenomenon increases wear in engine cylinders shortly after cold start?

A)Fuel dilution causing viscosity breakdown
B)Oxidation reduces oil lubricity
C)Carbon deposits block oil passages
D)Water condensation dissolving additives

💡 Explanation

During cold start, incomplete fuel combustion causes unburned fuel to enter the crankcase, diluting the oil, reducing viscosity, and causing boundary lubrication. Therefore fuel dilution is the risk, rather than oxidation, deposits or dissolution, which all require differing conditions and rates.

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