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Which risk dramatically increases when internal combustion engines operate far below their optimal temperature range?

A)Thermal runaway reduces efficiency
B)Oil undergoes rapid thermal cracking
C)Water accumulates in crankcase oil
D)Exhaust catalysts become permanently poisoned

💡 Explanation

Crankcase oil becomes diluted when engines operate far below optimal temps causing water accumulation, because incomplete combustion leads to blow-by; the water condenses rather than evaporating. This dramatically increases corrosion risks; therefore answer C, rather than thermal or catalyst issues.

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