Which risk increases when an internal combustion engine cylinder experiences piston ring blow-by?

💡 Explanation

When piston ring blow-by occurs, combustion gases leak past the piston rings into the crankcase, because of imperfect sealing leading to fuel and combustion byproducts contaminating the engine oil. Therefore reduced oil viscosity results, rather than increased valve temperature, elevated catalyst efficiency or decreased pulse width, which require different mechanical failures and effects.

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