What Are the Causes of Excessive Engine Oil Pressure?

[ReidFitz]

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.

[AdelynDella]

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.

[RubyAnn]

I've been driving an old car and often wonder about high oil pressure issues. There are many reasons for this. The main cause is clogged oil passages, such as carbon deposits from the engine blocking the pipes and hindering flow. Thickened oil due to aging increases resistance, naturally raising the pressure when pumping. It's also common for the pressure relief valve to get stuck or wear out, failing to regulate output. Even external factors like cold starts in winter can cause initially high pressure, but if it persists, it's a bad sign. For prevention, stick to the recommended oil change intervals and only use the types recommended by the brand. If you notice warning lights or unusual engine noises, stop driving immediately and get it repaired to avoid further issues.

[LeonardoLee]

Excessive oil pressure is typically caused by increased system resistance or pump failure. Key reasons include: oil viscosity being too high, such as using an incorrect grade of thick oil that increases pump load; clogged oil passages like a dirty filter or deposits in the lines restricting flow; a faulty relief valve unable to release pressure; or abnormal pressure buildup due to oil pump wear. This pressure buildup can lead to engine component damage, such as oil seal leaks or bearing wear. For maintenance, using the right temperature-grade oil and timely filter replacement are crucial. A simple self-check involves inspecting the dipstick for dirt—early intervention saves money and hassle.