What is the Suitable Oil Viscosity Grade for Winter?
2 Answers
5W-40 oil is suitable for external temperature ranges from -30°C to 40°C; while 10W-30 oil is suitable for external temperature ranges from -25°C to 30°C. Both of these are acceptable. Details are as follows: 1. Lubricant labeling: The viscosity of lubricating oil is often indicated using SAE grade labels, such as SAE40, SAE50, or SAE15W-40, SAE5W-40. The 'W' stands for winter, and the smaller the number before it, the better the oil's low-temperature fluidity, indicating a lower usable environmental temperature and better engine protection during cold starts. 2. Oil temperature resistance: 5W withstands external low temperatures of -30°C, 10W withstands -25°C, 15W withstands -20°C, 20W withstands -15°C, 30 withstands external high temperatures of 30°C, 40 withstands 40°C, and 50 withstands 50°C.
I remember one winter morning when starting the car was particularly difficult, with the engine making a rough sound. Later, I learned the issue was with the oil viscosity rating. In winter, you need to use low-viscosity oils like 5W-30 or 0W-20—the 'W' stands for winter, meaning it flows quickly at low temperatures to provide protection. From my experience, 5W-30 is sufficient for regular family cars, ensuring smooth starts in sub-zero temperatures. Always refer to the vehicle manual, as requirements vary by model; my manufacturer recommends 5W-30 year-round, but I check the oil level more frequently in winter. Some people use 10W-40, which can cause the engine to seize in cold weather—definitely not worth it. Don’t delay oil changes, and synthetic oils offer more stable performance and better wear resistance. After sharing my experience online, I picked up more tips from friends, like changing the oil before a sudden temperature drop to ensure safe and hassle-free driving.
