If the oil pressure of a cold engine is higher than at normal operating temperatures, the

The statement that if the oil pressure of a cold engine is higher than at normal operating temperatures, the engine's lubrication system is probably operating normally, reflects a sound understanding of how oil behaves in engines. When an engine is cold, the oil is also cold, and its viscosity is greater, leading to higher pressure readings. As the engine warms up, the oil thins out, reducing resistance and consequently lowering the oil pressure.

This characteristic is typical in many engines; thus, seeing higher oil pressure when the engine is cold does not automatically indicate a problem. Therefore, as long as the oil pressure behaves as expected according to the temperature of the engine, everything is functioning correctly.

In contrast, readjusting the oil system relief valve or activating the oil dilution system would not be necessary simply based on oil pressure readings at cold temperatures. These actions typically respond to issues that indicate malfunction or abnormal operating conditions. Indicating that the engine requires immediate service based on the cold oil pressure alone overlooks the fact that higher pressures are standard in cold conditions, not necessarily a sign of trouble.