What does it indicate if the oil pressure of a cold engine is higher than at normal operating temperatures?

When observing that the oil pressure of a cold engine is higher than during normal operating temperatures, this typically implies that the lubrication system is functioning correctly under cold conditions. In cold engines, the oil is more viscous, which can contribute to higher oil pressure readings as the oil pump works harder to circulate the thicker oil throughout the engine.

As the engine reaches normal operating temperatures, the oil thins out, reducing resistance in the system and allowing for smoother flow, which results in a decrease in oil pressure. Thus, initially high cold oil pressure indicates that the lubrication system is effectively maintaining pressure despite the increased viscosity of the cold oil.

While it might raise concerns about other issues, such as potential blockages or oil that is too thick, these are not typically the primary indicators when only considering the cold engine's behavior. The increase in pressure due to the nature of oil viscosity is a standard characteristic and indicates that the lubrication system is operating as designed under cold conditions.