What is the difference between engine oil 20 and 30?

[DelAna]

The viscosity of engine oil differs, as does its sealing performance. Below is a detailed explanation of the differences between engine oil 20 and 30: 1. Different oil viscosity: The primary difference between 5W30 lies in the high-temperature viscosity of the oil. The distinction between 5W-20 and 5W-30 is merely the difference in the latter numbers. 5W20 has lower viscosity (ranging between 5.6-9.3), which is relatively more fuel-efficient and provides a lighter driving feel. On the other hand, 5W-30 has higher viscosity (ranging between 9.3-12.5), which is relatively more fuel-consuming and makes the throttle feel heavier, but results in quieter engine noise. 2. Different sealing performance: The higher the viscosity, the better the sealing performance. For engine oils 5W30 and 5W20, the number after the W represents the high-temperature viscosity. Therefore, 5W30 has better sealing performance than 5W20. However, a higher number is not always better, as higher viscosity leads to greater friction and consequently greater power loss in the engine.