What is the difference between 0W and 5W engine oil?
2 Answers
The differences between 0W and 5W engine oil are: 1. Different low-temperature viscosity: Low-temperature viscosity refers to low-temperature fluidity. 'W' stands for winter in English, and the number before 'W' represents the oil's low-temperature fluidity. The smaller the number, the lower the low-temperature viscosity of the oil, the better its fluidity, and the more resistant it is to low temperatures. 2. Different low-temperature resistance: Generally, 0W oil can withstand temperatures as low as -35°C, while 5W oil can only withstand temperatures as low as -30°C. As the temperature drops, the oil becomes more viscous, increasing the resistance when the engine starts. If oil with poor low-temperature fluidity is used in extremely cold conditions (tens of degrees below zero), it may cause the car engine to struggle to start or even fail to start.
The difference between 0W and 5W engine oils lies in their low-temperature fluidity, which affects engine protection during cold starts. The smaller the number before the W, the faster the oil flows in cold weather. For instance, 0W oil maintains fluidity at around -35°C, while 5W struggles at approximately -30°C. As a mechanic, I've seen many car owners face starting difficulties in winter due to incorrect viscosity choices, leading to drained batteries or engine wear. In reality, the choice depends on your regional climate—0W is recommended for extremely cold northern areas, while 5W suffices for milder southern regions. Additionally, full synthetic oils generally perform better in low temperatures, reducing friction and fuel consumption during startup. Don’t underestimate this small number—it directly impacts engine lifespan and maintenance costs. Regularly checking the oil’s condition is also crucial to prevent degradation from affecting performance.
