Is 0W or 5W engine oil better?
2 Answers
Here is an introduction about whether 0W or 5W engine oil is better: 1. The difference between the two: Both 0W and 5W engine oils are winter-grade oils, but they differ in low-temperature viscosity, which refers to low-temperature fluidity. 2. Letter representation: 'W' stands for 'Winter' in English, and the number before 'W' indicates the oil's low-temperature fluidity. The smaller the number, the lower the low-temperature viscosity of the oil, the better the fluidity, and the more resistant it is to low temperatures. 3. Fluidity: The difference between 0W and 5W engine oils lies in the fact that 0W has better low-temperature fluidity than 5W. 4. Low-temperature resistance: 0W and 5W engine oils also differ in their low-temperature resistance. Generally, 0W oil can withstand temperatures as low as -35°C, while 5W oil can only withstand temperatures down to -30°C. Since engine oil becomes more viscous as the temperature drops, it increases the resistance during engine startup. If oil with poor low-temperature fluidity is used in extremely cold conditions, it may result in weak engine startup or even failure to start.
I grew up in Heilongjiang, where temperatures of -20 to -30 degrees Celsius in winter are common. Having driven several older and newer cars, I feel that choosing 0W oil is a lifesaver—cold starts are much smoother compared to 5W, which can freeze the engine. 0W flows better in low temperatures, ensuring the engine starts immediately, reducing battery strain and mechanical wear. If you live in a warmer area, 5W is sufficient and more cost-effective. Remember to check the oil viscosity rating: the smaller the number before the W, the better the cold resistance, and it also saves a bit on fuel. Regular maintenance, including frequent oil filter changes and proper low-temperature protection, ensures safer driving, especially during early morning trips when safety comes first.