What is the difference between 5w40 and 10w40 motor oil?

[LaDamian]

5W40 and 10W40 motor oils differ in their resistance to external low temperatures and their suitable usage environments. 1. Difference in resistance to external low temperatures: 5W40 motor oil can withstand external low temperatures of -30°C, while 10W40 motor oil can withstand external low temperatures of -25°C. Both 5W40 and 10W40 can withstand external high temperatures of up to 40°C. 2. Difference in usage environments: 5W40 is mainly suitable for colder northern regions, energy-efficient engines with low to medium load intensity, low to medium speeds, and smaller compression ratios. 10W40 is primarily suitable for southern regions with higher temperatures, frequent aggressive driving, mountainous areas with heavier loads, or vehicles that travel for extended periods, such as taxis and minivans.