What do the numbers and letters on engine oil mean?

[DiElle]

The numbers and letters on engine oil represent the following: Taking 5W30 as an example, the number before W indicates the freezing point temperature. The smaller the number, the lower the viscosity, the better the low-temperature fluidity, and the lower the applicable temperature. The number after W represents the kinematic viscosity of the oil at 100 degrees Celsius. The smaller the number, the lower the viscosity, the better the low-temperature fluidity, and the lower the applicable temperature. When using engine oil, ensure that the oil grade is correct and that the oil is genuine. Using counterfeit or substandard oil can damage the engine. Engine oil, also known as engine lubricant, serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine.