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Which outcome significantly reduces compression with worn piston rings?

A)Crankcase pressure increases dramatically
B)Oil consumption rates decrease
C)Thermal efficiency will increase
D)Combustion timing becomes optimized

💡 Explanation

Increased crankcase pressure will occur with worn piston rings caused by excess blow-by; the mechanism is gas leakage past seals. Because high pressure leaks increase; therefore high oil consumption is common rather than decreased consumption predicted by options B, C and D.

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