The Main Function Of Engine Oil

The engine is the heart of the car. There are many metal surfaces in the engine that rub against each other. These parts move fast, the environment is poor, and the operating temperature can reach 400℃ to 600℃. Under such harsh working conditions, only qualified lubricants can reduce the wear of engine parts and extend their service life. So what requirements should qualified lubricants meet? In other words, what are the seven major functions of lubricants?
1. Lubrication: There is rapid relative sliding between the piston and the cylinder, and between the main shaft and the bearing. To prevent the parts from wearing too quickly, it is necessary to establish an oil film between the two sliding surfaces. An oil film of sufficient thickness separates the surfaces of the parts that slide relatively, thereby achieving the purpose of reducing wear.
2. Auxiliary cooling and cooling: The engine oil has a low specific heat value and does not have a cooling effect inside the engine. However, due to the combustion of fuel in the engine, heat energy is generated. When the engine is working, the engine oil can bring the heat back to the oil tank and then dissipate it into the air to help the water tank cool the engine. The real cooling effect is the water (or antifreeze liquid) outside the engine shell.
3. Cleaning: Good engine oil can bring carbides, sludge, and wear metal particles on engine parts back to the oil tank through circulation, and wash away the dirt generated on the working surface of the parts through the flow of lubricating oil.
4. Sealing and leak prevention: Engine oil can form a sealing ring between the piston ring and the piston to reduce gas leakage and prevent external pollutants from entering.
5. Rust and corrosion prevention: Lubricating oil can be adsorbed on the surface of parts to prevent water, air, acidic substances and harmful gases from contacting parts.
6. Shock absorption and buffering: When the pressure at the engine cylinder port rises sharply, the load on the piston, piston chips, connecting rod and crankshaft bearings is suddenly increased. This load is transmitted and lubricated by the bearing, so that the impact load is buffered.
7. Anti-wear: Adding lubricant to the friction surface can reduce the friction coefficient, thereby reducing friction resistance, saving energy consumption, and reducing wear: Lubricants can reduce the wear caused by abrasive wear, surface fatigue, adhesive wear, etc. between the friction surfaces.
How are automotive engine oil grades divided? When purchasing engine oil, the correct engine oil grade is the first factor to consider. How do you choose the right motor oil for your car from among the numerous motor oil products? First, you need to understand how motor oil grades are divided.