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← ScienceWhich 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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