Can 5W-30 engine oil be used in winter?

[MacValeria]

5W-30 engine oil can be used in winter. However, it depends on the minimum temperature of the vehicle's operating region. The minimum operating temperature for 5W-30 engine oil is -30 degrees Celsius. If the local temperature falls below -30 degrees Celsius, this oil cannot be used, and 0W-grade oil should be used instead. In 5W-30, "W" stands for "winter," indicating suitability for winter use. The number "5" before the "W" represents the oil's viscosity at low temperatures—the smaller the number, the better the fluidity and cold resistance. The "30" refers to the viscosity at 100 degrees Celsius—the higher the number, the greater the viscosity and heat resistance. Winter engine oil must meet three key characteristics: low viscosity, low pour point, and good anti-wear properties. These ensure optimal engine protection. Since winter temperatures are lower, engine oil tends to have poorer fluidity when cold. Some oils may even solidify in sub-zero temperatures below -10 degrees Celsius. Therefore, winter-grade oil must have excellent low-temperature fluidity.