What does 5w-30 mean?

[SanVera]

5w-30 on engine oil represents the oil's viscosity grade, with each number indicating its performance parameters. Here's relevant information about engine oil: 1. Basic knowledge of engine oil: Engine oils can be broadly categorized into two types - mineral oil and synthetic oil. Synthetic oil can be further divided into semi-synthetic and full-synthetic oils, with the fundamental difference lying in their base oils. In terms of performance, synthetic oil outperforms mineral oil in both low and high temperature environments. As the saying goes, you get what you pay for, so synthetic oils are more expensive than mineral oils. 2. Number meanings: In 5w-30 oil, the 5 represents the oil's low-temperature fluidity - the smaller the number, the lower the ambient temperature it can be used in (5 indicates resistance to external temperatures as low as -30°C). The W stands for Winter, and the final 30 indicates the kinematic viscosity standard at 100°C is 30.