What Causes Low Oil Pressure?
2 Answers
Here are the specific reasons for low engine oil pressure: 1. The oil does not meet the requirements, the viscosity is too low, or the oil level in the crankcase is too low. 2. The oil pump's intake filter screen is clogged, resulting in insufficient oil pumping. 3. The oil pump gears are excessively worn, reducing the pump's oil delivery capacity. 4. The pressure relief valve in the main oil passage opens at too low a pressure, causing premature and excessive oil return. 5. The oil filter element is clogged, increasing the oil intake resistance. 6. Excessive clearance in lubricated parts, especially in the crankshaft main bearings and connecting rod bearings, leads to excessive oil leakage. Excessive clearance between the piston and cylinder wall causes increased oil temperature due to gas leakage, resulting in reduced viscosity. 7. Oil leakage from the front and rear crankshaft oil seals, main oil passage plugs, or oil pipes. 8. The oil pressure gauge, sensor failure, or oil passage blockage leads to inaccurate measurements.
I've been driving for years, and the most common cause of low oil pressure is insufficient oil level. I've experienced this myself when I forgot to check the dipstick regularly. Additionally, the oil pump might be worn out and unable to pump oil properly; if the oil filter is clogged, restricted oil flow can also cause pressure to drop. Oil that's too thin or dirty, losing viscosity under high temperatures, can lead to unstable pressure as well. If the bearing clearances inside the engine are too large, oil leaks quickly, preventing pressure from building up. A faulty sensor might also falsely indicate low pressure. If not addressed promptly, the engine can easily overheat or seize, leading to frighteningly high repair costs. I recommend checking the oil level every month and using high-quality oil—don't wait for the warning light to come on. Safety first.
