In which season is 15W50 engine oil used?
2 Answers
15W50 engine oil is suitable for use at temperatures above -20℃ and is a high-viscosity oil. Therefore, it is an all-season oil in southern regions, but not in northern areas like Harbin. If the local temperature drops below -20℃, 15W50 engine oil will lose its fluidity, meaning it will freeze. Below is an explanation of the meaning of 15W50 engine oil: 1. The '15' indicates the minimum applicable temperature of the oil, which is -20℃. 2. The '50' represents the high-temperature viscosity of the oil, with a kinematic viscosity of 19cst when the engine is at 100℃. 3. The 'W' in the label stands for Winter: The number before it indicates the oil's low-temperature fluidity—the smaller the number, the better the low-temperature fluidity. The number after 'W' represents the oil's viscosity grade at 100℃—the larger the number, the better the protection the oil provides to the engine at high temperatures.
I've been driving trucks for decades, and choosing the right engine oil is crucial for smooth engine performance. For 15W50 oil, the 'W' stands for winter viscosity, with '15' indicating relatively average low-temperature fluidity—it can start at around -20°C but struggles in cold weather. The '50' represents high-temperature viscosity, which ensures lubrication stability under heat, making it ideal for spring, summer, and autumn, especially in hot weather when it prevents engine overheating. However, in extremely cold winters, like sub-zero temperatures in northern regions, it's unsuitable as it strains the starter and accelerates part wear. I recommend it year-round in temperate zones, but in colder areas, switch to thinner oil like 5W30 in winter. Remember to check the dipstick regularly—don’t wait until the oil discolors to change it, as minor issues can escalate into costly repairs. This oil works well for older cars, offering strong heat resistance.
