In a truck, if the gauge shows a lubrication pressure lower than usual with no apparent mechanical fault, what temperature is the engine oil probably at?

Question

DentroTest · Accepted Answer

The viscosity of lubricating oil varies directly with temperature. When engine oil overheats, it loses viscosity and becomes much more fluid and thin. As it offers less resistance as it passes through the ducts of the lubrication circuit, the pump generates less pressure and the gauge reads lower than usual values, without this necessarily meaning that a component has broken. By contrast, when the oil is cold it is denser and thicker, which creates higher pressure in the circuit. When it is warm or in its optimal operating range, the pressure stays at the normal values specified by the manufacturer.

In a truck, if the gauge shows a lubrication pressure lower than usual with no apparent mechanical fault, what temperature is the engine oil probably at?

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