What Causes High Oil Pressure in a Car?
2 Answers
Reasons: Malfunctioning oil gauge or sensor; Excessive oil viscosity; Blockage in the main oil passage or oil passages leading to the crankshaft bearings inside the cylinder block; Over-adjusted opening pressure of the oil pressure relief valve, or excessively stiff spring in the relief valve; Clogged oil filter with the bypass valve failing to open. Below is some information about high oil pressure: 1. Normal phenomenon: During daily vehicle use, negative pressure or air pressure in the fuel tank are normal occurrences. As long as there are no other issues with the car, it is not a problem. 2. Under high-temperature conditions: High temperatures can cause increased gasoline evaporation, and if the carbon canister solenoid valve hasn't had time to adsorb these excess fuel vapors, it can result in higher oil pressure, which is a normal phenomenon.
The last time I encountered high oil pressure was when driving out on a cold winter day, and the oil pressure gauge suddenly spiked, which scared me to death. There are several main reasons for this issue: First, the oil viscosity is too high, such as using the wrong type of oil or the oil thickening in low temperatures, causing poor flow. Second, the oil filter is clogged, with accumulated dust blocking the oil passage, leading to pressure buildup. Third, the oil pump is malfunctioning, generating excessive pressure. Fourth, the pressure relief valve is stuck and fails to open, preventing pressure release. Fifth, the internal engine bearing clearance has decreased, or the sensor is giving a false reading, misreporting the oil pressure value. Additionally, using counterfeit oil can also affect viscosity, so it's essential to check the oil quality carefully. Don’t delay in handling this issue—first, stop the car and check the oil level and filter condition. If that doesn’t help, quickly visit a repair shop for part replacement or repairs. Otherwise, severe engine wear can lead to high repair costs. For regular maintenance, always choose the appropriate viscosity oil and change it periodically.
