How often should engine oil be changed at least?

[DiJoshua]

Engine oil should be changed every 6 months or 5,000 kilometers. Engine oil is the lubricant used by the engine, composed of base oil and additives. Relevant information is as follows: 1. Engine oil can lubricate and reduce wear on the engine, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption. 2. Base oil is the main component of lubricating oil, determining the basic properties of the lubricating oil, while additives can compensate for and improve the shortcomings of the base oil's performance, giving it certain new properties. 3. The 'W' in engine oil stands for winter. The smaller the number before the 'W', the lower the viscosity at low temperatures, the better the low-temperature fluidity, and the lower the applicable temperature. The larger the number after the 'W', the higher the viscosity, and the higher the applicable temperature.