Is 5W30 a Fully Synthetic Engine Oil?

[JoyFitz]

5W30 is the SAE grade of engine oil, indicating its viscosity value, and cannot determine whether it is fully synthetic or not. More information about 5W30 is as follows: 1. Mineral oil, semi-synthetic oil, and fully synthetic oil can all be 5W30. 2. In the engine oil grade, the symbol W stands for Winter, and the smaller the number before W, the lower the low-temperature viscosity and better the low-temperature fluidity, making it suitable for lower minimum temperatures; the larger the number after W, the higher the viscosity, making it suitable for higher maximum temperatures. 3. 5W30 engine oil is an all-season oil, meaning it is suitable for use throughout the year.