The higher the oil pressure, the better?

Many drivers don't have a special understanding of their car. For the car, it only stays in the opening stage. Here are some related questions about the engine oil pressure of the car owners. Many of the riders are not very Understand what the state of the car's oil pressure should be maintained.

A. The higher the pressure of the engine oil, the better?

Under the premise of normal engine system operation, the oil pressure is mainly determined by the oil pump speed (engine speed) and engine oil viscosity. When the engine speed is the same, when the oil temperature is equal, the pressure of the single-stage oil SAE 40 is higher than the pressure of SAE 30 or SAE 20. It is generally believed that the higher the oil pressure, the better the lubrication, but this is not the case. The oil pressure is only a measure of the oil pressure in a plain bearing. The engine has been designed with oil pressure to ensure lubrication within the specified range. Especially in the winter, if you use the engine oil with higher SAE grade, the oil pressure gauge shows a big value when starting the engine. Because the temperature of the newly started oil is low and the viscosity is very high, it is impossible to “splash” the oil to the wall cylinder and At the piston ring, this will greatly reduce the lubrication of the oil to the bearing, cylinder wall and piston, which is extremely harmful to the engine.

　

In addition, when the viscosity of the oil is high, the lubricating oil cannot flow continuously due to the large flow resistance of the oil, and the lubricating effect cannot be achieved despite the oil pressure gauge pointing to a higher position.

B. Will it be possible to change the oil pressure of different brands of oil of the same grade?

This may sometimes occur in actual use. If the original low oil is used, sediment will be generated in the oil passage during use, so that the resistance in the oil passage is large and the oil pressure gauge will display a higher value. If you switch to high-grade engine oil, it will gradually remove dirt inside the cylinder and oil passages after a few hours of engine operation because of its excellent clean dispersion. Because the high-grade engine oil also cleans the engine's cylinder block and oil circuit while the engine is running, the blockage is reduced. At this time, the oil pressure will be slightly lowered, causing some drivers to mistake the new oil too thin or of poor quality. In fact, on the contrary, it is this kind of clean and dispersible high-quality engine oil that creates conditions for the engine to enter full lubrication.

C. Reasons for low oil pressure and oil pressure light and the treatment measures taken:

The cause of the engine problem is very complicated. First of all, the latest high-quality oil should not be suspected. Instead, a comprehensive analysis and inspection should be carried out. The vehicle is monitored by the oil pressure lamp. The light is on or off, indicating whether the oil pressure exists. When the vehicle's oil pressure lamp is shining, many drivers simply blame this fault on the engine oil used, which is extremely wrong. Such failures are generally not related to oil.

The above is some of the related issues about the engine oil pressure that Xiaobian has compiled for the riders. I hope that the riders can learn more.