What does C5 0W20 engine oil mean?

[VanEverly]

C5 refers to the testing and certification standard for automotive lubricants established by the European automobile manufacturing industry. 0W20 engine oil indicates that it has the best low-temperature fluidity but relatively average high-temperature performance. Here is more information about engine oil: 1. Composition: Engine oil consists of base oil and additives. Base oil is the main component of lubricating oil, determining its basic properties, while additives can compensate for and improve the shortcomings of base oil performance and provide certain new properties, making them an important part of lubricating oil. 2. Function: Reduces wear and extends the engine's service life. 3. Performance: Lubricity; low-temperature operability; viscosity-temperature characteristics; oxidation resistance; foam resistance. 4. Checking shelf life: The simplest way to check the shelf life of engine oil is to observe whether the viscosity of the oil has changed, determine if the smell of the oil has faded, and observe whether the color of the oil has changed. When observing changes in oil color, pay attention to changes in the additives within the oil.