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Which risk increases when an internal combustion engine piston experiences oil film breakdown under high load?

A)Accelerated cylinder wall wear
B)Increased exhaust gas temperature
C)Spark plug fouling from lubricant
D)Valve float due to thermal expansion

💡 Explanation

When oil film breaks down in an engine piston under high load, boundary lubrication occurs because direct contact between the piston and cylinder wall causes adhesive wear. Therefore, accelerated cylinder wall wear results, rather than increased exhaust temperature, plug fouling, or valve float which involve different failure mechanisms.

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