What does 5w30 mean for engine oil?

[VanSadie]

Engine oil 5w30 is a multi-grade viscosity. Here is the relevant introduction of engine oil 5w30: 1. The number 5 represents the ability to withstand external low temperatures of -30 degrees Celsius, and the smaller the number, the lower the ambient temperature it can be used in; 2. The number 30 represents the kinematic viscosity standard of 30 at 100 degrees Celsius, and this number indicates the oil's high-temperature resistance index. The larger the value, the better the protective performance of the oil at high temperatures. Here is the introduction to the role of engine oil: 1. It separates the surfaces of relatively sliding parts, thereby reducing wear; 2. It brings heat back to the oil tank and then dissipates it into the air to help the radiator cool the engine; 3. It circulates carbon deposits, sludge, and worn metal particles on engine parts back to the oil tank, flushing away dirt generated on the working surfaces of parts through the flow of the lubricating oil.