In which season should 15w50 engine oil be used?

[DiTeagan]

15w40 engine oil is winter oil, where 'w' stands for winter. The number before 'w' represents the freezing point temperature, with 15w corresponding to a freezing point of -20℃. The number after 'w' indicates the kinematic viscosity of the oil at 100℃, with higher numbers indicating higher viscosity. Related information: 1. Engine oil: Also known as engine lubricant, with a density of approximately 0.91×10³(kg/m³), it serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. It is often referred to as the 'blood' of the car. 2. Meaning of the numbers: The number before the letter indicates the lower environmental temperature at which the oil can be used, with better engine protection during cold starts. The number after the letter represents the oil's high-temperature resistance, with higher numbers indicating better protective performance at high temperatures.

[LeEdward]

I recommend using 15W50 oil primarily in warm seasons, such as spring and summer, because its low-temperature fluidity is moderate, and its high-temperature viscosity is sufficient to better protect the engine and prevent overheating wear. For example, I always use 15W50 in the summer when driving, and the engine runs smoothly with less noise. However, avoid using it in cold regions during winter, as 15W can make starting difficult below freezing and even damage components. Therefore, I usually switch back to lower-viscosity oil like 5W30 before the cold weather sets in. If the weather is mild, around 20°C during spring or autumn, it can also be used, but remember to check the vehicle condition and local temperature changes. Based on personal experience, don’t stubbornly stick to seasonal transitions—safety comes first.

[LeJosephine]

When I modify cars, I use 15w50 oil, especially in hot weather or racing conditions. The high viscosity of 50 ensures proper lubrication at high temperatures, preventing engine cylinder shrinkage. For example, during summer track days with temperatures reaching 35°C, this oil is perfect. However, in winter when it's too cold and startup is slow, I avoid using it. If you live in a consistently hot place like Hainan, you can use it year-round without issues. But in temperate regions, I recommend using 15w50 from spring to early autumn and switching to lower W-number oils in other seasons. Choosing engine oil should consider actual driving conditions and climate—it's more suitable for aggressive driving styles.

[ChaseLynn]

In my daily driving, I use 15w50 oil during the warm seasons, such as from spring to early autumn, when the temperature ranges between 15-30 degrees Celsius. The high-temperature protection of 50 in summer is excellent for the engine, reducing friction. If cold air arrives in winter, 15w may cause starting difficulties, so I switch to 5w or 10w in advance to avoid trouble. After all, choosing the wrong oil wastes fuel and harms the car. My approach is to adjust the oil based on weather forecasts—using 15w50 during warm seasons is both safe and cost-effective. Regular maintenance also involves monitoring oil quality changes.