What is the difference between 0W20 and 0W40?

[VanFernando]

The differences between 0W20 and 0W40 are as follows: 1. 0W20 oil has a thinner viscosity value, excellent low-temperature protection performance, can reduce resistance inside the engine and save gasoline, but its high-temperature protection capability depends on the specific conditions of the engine. On the other hand, 0W40 oil performs well in both high-temperature and low-temperature protection. 2. 0W20 is only suitable for some new-style engines from Japanese, Korean, and American manufacturers, while 0W40 is suitable for most engines. Here is more information about the two types of oil: 1. 0W indicates the low-temperature viscosity of both oils. 2. The number after W represents the high-temperature fluidity of the oil at 100 degrees Celsius. The larger the number, the worse the high-temperature fluidity, so the high-temperature fluidity of 0W40 is worse than that of 0W20. 3. The fact that 0W40 has worse high-temperature fluidity than 0W20 does not mean that the quality of 0W40 is worse than that of 0W20. The purpose of setting multiple high-temperature fluidities for oil is to meet the needs of different engines. When choosing oil, it is necessary to select based on the actual conditions of the engine.