Which Engine Oils Are Suitable for Winter Use in Cars?

[LaWalter]

For winter use in cars, engine oils with grades such as 0W, 5W, 10W, 15W, 20W, and 25W are more appropriate. The symbol W stands for winter, and the smaller the number before W, the lower the viscosity at low temperatures, the better the low-temperature fluidity, and the lower the applicable minimum temperature. The larger the number after W, the higher the viscosity, ensuring more stable protection at high temperatures. Engine oil serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption and cushioning. Engine oil consists of two parts: base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve the deficiencies of the base oil, imparting certain new properties, making them an important part of the lubricant.

[SanAliyah]

The first number in the oil grade is the most important factor when choosing oil for winter. As an experienced driver with over 20 years behind the wheel, I know best that in northern regions where temperatures drop below -20°C, you should use oil starting with 0W, such as 0W-20. The smaller this number, the better the low-temperature fluidity, ensuring proper lubrication as soon as the cold engine starts. For new cars, I recommend using full synthetic oil—it protects the engine and saves fuel. For older cars over ten years, 5W-30 semi-synthetic oil is more economical. Last month, I switched to Shell 0W-40, and even at -18°C in the morning, starting the car was effortless. Remember not to use high-viscosity summer oil in winter, as it can freeze and damage the engine. Regularly check the oil dipstick, as consumption increases faster in cold weather.

[CharlotteFitz]

As a long-haul logistics driver, I believe winter engine oil should balance cold starts and long-distance protection. My top choice is 0W-30 full synthetic—quick flow and high-temperature resistant. In Northeast China where temperatures drop to -30°C, 0W-20 is necessary, while 5W-30 suffices for southern regions around -10°C. Our fleet uniformly uses Castrol Edge, with oil change intervals reaching 10,000 km. Always check oil levels before loading; replace if cloudy. Using 15W-40 in heavy trucks actually increases fuel consumption, whereas my new China VI light truck with 5W-30 saves 8% on fuel. Good oil means quiet oil pump noise in cold conditions.

[VonZoe]

Having lived in Harbin for half my life, I know that 0W-grade engine oil is a must when temperatures drop to -30°C in winter. Last year, my car with 5W-40 oil was left in the garage overnight, and the engine made a rattling noise when starting the next morning. After switching to Mobil 0W-20, cold starts became much smoother. For an old Jetta, 5W-30 mineral oil is sufficient, but hybrid new energy vehicles require low-ash 0W-16. It’s essential to check the oil level monthly, as consumption speeds up significantly during cold waves. Driving on icy roads also demands extra attention to oil temperature.