What are the characteristics of high-quality engine oil?

1. ** Lubrication and Wear Reduction ** : One of the most fundamental and important functions of engine oil is to provide lubrication for the moving parts inside the engine. It can effectively form a protective film on the metal surface, thereby reducing direct contact and friction between components and further lowering the wear rate. 2. ** Cooling effect ** : Besides lubrication, engine oil also plays the role of an auxiliary coolant. When the engine is running, some of the heat is carried away through the oil circulation and dissipated through heat dissipation devices such as the oil pan, helping to maintain the engine within a suitable operating temperature range 3. ** Cleaning and Rust Prevention ** : High-quality engine oil contains specially designed additives. These components can help remove deposits, carbon deposits, metal shavings and other impurities produced inside the engine and keep them suspended in the oil until they are discharged when the oil is changed next time. 4. ** Sealing Effect ** : The appropriate viscosity enables the engine oil to form an effective sealing layer between the piston rings and the cylinder wall. This not only helps maintain the compression ratio and ensure the normal operation of the engine, but also reduces the possibility of fuel leakage. Good sealing performance plays a positive role in improving combustion efficiency, reducing fuel consumption and emission levels.