What are the differences between 0w40 and 5w40 engine oils?

[DiCole]

The difference between 0w40 and 5w40 engine oils lies in their low-temperature flow performance. The relevant introductions about 0w40 and 5w40 engine oils are as follows: Different flowability: 0w40 engine oil can flow normally at minus 35 degrees Celsius; 5w40 engine oil can flow normally at minus 30 degrees Celsius. Meaning of 'w': 'w' stands for winter, and the smaller the number before it, the better the low-temperature flowability of the engine oil, indicating a lower usable environmental temperature and better protection for the engine during cold starts. The number after 'w' represents the kinematic viscosity of the engine oil at 100 degrees. The higher the value, the higher the viscosity. If the vehicle operates under high-speed or extreme load conditions, it is more suitable to use engine oil with higher viscosity.