What does 15w50 engine oil mean?

[MacCayden]

Engine oil 15W50 indicates the minimum and maximum operating temperatures of the oil. Specifically, 15W represents a minimum usage temperature of -20°C, while the number 50 denotes the hot-start viscosity. A higher number (indicating a higher maximum applicable temperature) means a broader range of suitable temperatures. Below is an introduction to engine oil: 1. Function of engine oil: As a lubricant for the engine, engine oil not only provides lubrication and anti-wear effects but also offers cooling, cleaning, rust prevention, corrosion resistance, and oxidation resistance. The quality of the lubricating oil has a significant impact on the normal operation of the engine. High-quality oil, especially fully synthetic oil, not only protects the engine and reduces the frequency of oil changes but also saves on fuel costs. 2. Choosing high-quality engine oil: Although premium oil may cost twice as much as regular oil, its performance benefits are equivalent. Choosing inferior products to save money can lead to early engine wear, reduced engine lifespan, and in severe cases, catastrophic failures such as 'cylinder scoring and bearing seizure.'