What Are the Causes of Excessive Engine Oil Pressure?
2 Answers
Engine oil pressure may become excessive due to: 1. Excessive oil viscosity; 2. Improper adjustment of the pressure relief valve; 3. Malfunction of the oil pressure gauge or sensor. The functions of engine oil include: lubrication and anti-wear, auxiliary cooling, cleaning, sealing and leak prevention, rust and corrosion prevention, and shock absorption. Methods for engine maintenance are: 1. Use qualified engine oil; 2. Use qualified coolant and antifreeze; 3. Regularly clean the radiator scale; 4. Regularly remove engine carbon deposits; 5. Regularly replace the three automotive filters; 6. Maintain reasonable engine speed. The engine consists of: the engine block, crankshaft and connecting rod mechanism, valve train and intake/exhaust system, fuel supply system and governor, starting device, cooling system, and lubrication system.
I've worked in auto repair shops for many years, and the most common causes of high oil pressure I've seen are excessive oil viscosity or poor oil quality. For example, when car owners mistakenly use thick oil unsuitable for winter, the oil pump pressure spikes during cold starts; clogged oil passages are also a culprit, like when the filter isn't replaced on time and gets blocked by debris, restricting oil flow and increasing pressure. Additionally, a malfunctioning pressure relief valve failing to release pressure properly can cause the entire system to operate under sustained high pressure. Excessive wear on the oil pump can also lead to uncontrolled pressure increases. Such issues require early diagnosis; otherwise, bearings and seals are prone to damage. I recommend car owners regularly check oil quality and levels, use the correct viscosity oil, and prioritize prevention.
