What is the normal oil pressure at idle?

[MacMargaret]

For most car engines, the normal oil pressure range is between 2.5 to 3.5 units of pressure. At idle, the pressure should be around 2 to 2.5 units. Both excessively high and low pressures can be very harmful. Effects of oil pressure levels: If the engine oil pressure is too high, it can lead to increased fuel consumption. High-viscosity lubricants have greater viscosity, which increases the frictional resistance between mechanical components, leading to greater power loss and higher fuel consumption. It can also affect heat dissipation; higher viscosity lubricants circulate more slowly, reducing the rate at which heat is carried away, which can cause the engine to overheat. At the same time, insufficient oil volume can reduce the oil pump's output or prevent it from pumping oil due to air intake, which may also result in lower oil pressure. If the oil pressure is too low, it can compromise the engine's lubrication standards, leading to poor lubrication, cooling, and cleaning, which can cause parts to stick and become damaged. Excessive clearance between the crankshaft journal and bearings, low kinematic viscosity, or a damaged filter element can all result in low oil pressure. Functions of car engine oil: Reducing friction and high temperatures: A sufficiently thick oil film separates the surfaces of sliding parts, thereby reducing wear. Sealing: Oil can form a seal between the piston rings and the piston, reducing gas leakage and preventing contaminants from entering. Rust prevention: Lubricating oil adheres to part surfaces, preventing contact with water, air, acidic substances, and harmful gases. Cushioning: When pressure in the engine cylinder rises sharply, suddenly increasing the load on the piston, piston skirt, connecting rod, and crankshaft bearings, the lubricated transmission through the bearings helps cushion the impact load. Cleaning: Good-quality oil can carry carbon deposits, sludge, and worn metal particles from engine parts back to the oil pan. The flow of the lubricant washes away dirt generated on the working surfaces of the parts.