What is the difference between 10w and 5w engine oil?
2 Answers
The difference between 10w and 5w engine oil lies in their applicable minimum temperatures: 10w is suitable for a minimum temperature of -25 degrees Celsius, while 5w can be used at a minimum temperature of -30 degrees Celsius. The parameters of engine oil refer to its grade and viscosity specification. The quality level of engine oil ranges from SA to SN, with each successive letter indicating better performance than the previous one. The functions of engine oil are: 1. To reduce friction and high temperatures; 2. To minimize gas leakage and prevent external contaminants; 3. To prevent contact between water, air, acidic harmful gases, and engine components; 4. To cushion the pressure rise in the engine cylinder ports; 5. To clean dirt generated on the working surfaces of components.
I remember last winter, my car had a particularly hard time starting on a morning when it was over ten degrees below zero. After switching to 5W oil, it ran much smoother. Both 5W and 10W are viscosity grades for engine oil, with the main difference being their low-temperature fluidity: 5W flows better at around -30°C, reducing engine wear during startup; 10W can only handle down to about -25°C and is still usable in warmer places like southern cities. For daily driving, 5W is suitable for cold regions or winter, saving some fuel and protecting the engine; 10W works in moderate climates and might be a bit cheaper. When choosing oil, consider your location and the season—don’t just look at the numbers, but also the 30 or 40 that follows, as they perform similarly at high temperatures. Regular oil changes are also important for keeping your car in good condition and lasting longer.
