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Which risk increases when lubricating oil viscosity decreases in an internal combustion engine?

A)Increased wear from boundary lubrication
B)Volumetric efficiency decreases significantly
C)Excessive oil oxidation accelerates rapidly
D)Oil consumption decreases gradually therefore

💡 Explanation

Increased wear occurs because of boundary lubrication; reduced viscosity lowers the oil film thickness, therefore increasing metal-to-metal contact. This happens rather than improved lubrication, as higher viscosity provides a better film.

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