Is 15w40 engine oil suitable for winter use?

[Ida]

15w40 engine oil can be used in winter in southern regions, but it is not suitable in northern areas like Harbin where temperatures are relatively low. More information about 15w40 engine oil is as follows: 1. 15W40 engine oil is suitable for use at temperatures above -20℃. Since engine oil has a certain freezing point and viscosity, i.e., an applicable temperature range, and there are significant differences in winter temperatures between the north and south of China, whether 15W40 engine oil can be used depends on the local temperature conditions in winter and summer. 2. The meaning of 15W40: The number before W indicates the low-temperature fluidity of the engine oil, or the minimum applicable temperature of the oil. The smaller the number, the better the low-temperature fluidity and the lower the minimum applicable temperature. 15 indicates that the minimum applicable temperature is -20℃, and its low-temperature fluidity is relatively average. 40 represents the viscosity value of the oil, which is a relatively high-viscosity oil with good high-temperature protection performance.