Which frictional effect rises with engine oil temperature drop?

💡 Explanation

Lowering the temperature increases the viscosity of engine oil, creating greater viscous drag, because viscosity grows as temperature drops. Therefore viscous drag increases, rather than surface tension decreasing or convection increasing which require heat input.

• Which inefficiency increases when a Carnot engine's temperature difference shrinks?
• Which outcome occurs when lowering jacketed reactor temperature?
• Which outcome accelerates diffusion-driven hydrogen embrittlement in austenitic stainless steel?
• Which mechanism causes increased conductivity when graphene is doped with certain elements?
• Which state change occurs when dynamic equilibrium is disrupted in a saturated solution of potassium nitrate due to endothermic solvation?
• Which outcome occurs when a piezoelectric sensor, acting as a variable capacitor, vibrates at its mechanical resonance frequency?