What Causes Excessive Oil Pressure?

[CollinFitz]

Excessive oil pressure is caused by factors such as clogged oil fine filters, blocked or improperly adjusted pressure relief valves, and excessive oil viscosity. The details are as follows: Clogged Oil Fine Filter: If the filter element of the oil fine filter becomes too dirty and blocks the oil circuit, it can also lead to excessive pressure in the main oil passage. Therefore, the oil fine filter should be cleaned regularly. Excessive Oil Viscosity: The viscosity of engine oil is related to the engine temperature. When the temperature is high, the viscosity decreases, and vice versa. If the oil viscosity exceeds the specified value, the flow resistance of the oil in the lubrication system increases, and the pressure rises accordingly. During a cold start, if the oil is too viscous and the flow resistance is too high, the oil pressure gauge will indicate excessive pressure. However, at this time, the lubrication of the bearings and cylinder walls may not be sufficient. In such cases, the engine should idle for a few minutes to warm up the oil to above 50°C before driving. Additionally, if the wrong oil grade is selected and the oil itself is too viscous, the oil pressure will also increase.