Which risk increases when engine oil operates below its optimal viscosity range?

💡 Explanation

Increased hydrodynamic bearing surface wear occurs when oil viscosity is too low, because boundary lubrication replaces hydrodynamic lubrication. When viscosity decreases, the oil film becomes thinner, decreasing the bearing’s load-carrying capacity; therefore wear increases, rather than being reduced, as the lack of viscous support enables surface-to-surface contact.

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