Can 15W-40 engine oil be used in winter?
2 Answers
15W40 engine oil can be used in both winter and summer. When using this oil in winter, it is important to pay attention to the local temperature, as it should not be used in excessively low temperatures. Below is a detailed introduction to the specific situation: 1. The meaning of the viscosity grade 15W40: The number before the W indicates the oil's low-temperature fluidity, which can also refer to the minimum applicable temperature of the oil. The smaller the number, the better the low-temperature fluidity, and the lower the minimum applicable temperature. The number 15 indicates that the minimum applicable temperature is -20℃, and its low-temperature fluidity is relatively average. The number 40 represents the viscosity value of the oil, which is a relatively high-viscosity oil with good high-temperature protection performance. 2. 15W40 engine oil is suitable for use in temperatures above -20℃, so it can be used in winter in southern regions of China. However, it is not suitable for use in colder northern regions such as Harbin. Since engine oil has a certain freezing point and viscosity, meaning it has a specific applicable temperature range, and the winter temperatures vary significantly between the north and south of China, it is necessary to consider the local temperature conditions in both winter and summer.
I personally think that 15W-40 engine oil should be used with caution in winter, especially if you live in extremely cold areas. The "W" in the oil grade stands for winter, and 15W indicates that it doesn't flow well at low temperatures. For example, when the temperature drops below -20°C, the oil may thicken like syrup, making it difficult to start the engine, increasing the risk of engine wear, and potentially shortening battery life. When I usually check my car, I highly recommend 5W or 10W series oils, as they flow more smoothly in cold weather, reducing startup issues. It's also important to refer to the vehicle manual's recommendations, as most modern cars require low-viscosity oil during cold seasons. Don't try to save money by using the wrong oil—a small mistake during sudden winter temperature changes can lead to skyrocketing repair costs. I suggest changing the oil according to the season and regularly checking the oil condition to prolong the engine's lifespan.
