10w-40 engine oil is suitable for winter use in northern China?

10W-40 engine oil can be used normally above minus 20 degrees, and the temperature in Harbin in the north can be as low as minus 20 degrees to around 30 degrees. 10W-40 engine oil is not suitable. Use 5W-40 or 0W-40 engine oil.

10w-40 is SAE standard viscosity value, and w stands for winter. The brands of oil used in winter are 0W, Zhuanwu, 10W, 15W, 20W, 25W and W respectively. The smaller the number before W, the smaller the low-temperature viscosity, the better the low-temperature fluidity and the lower the applicable minimum temperature. The number after W represents 100℃ engine oil.

Extended data:

If compared with 10w30, 10w40 means higher oil viscosity and better sealing performance, and the engine will consume more oil. At idle speed, the higher the oil viscosity, the lower the noise. In the driving state, the higher the viscosity, the louder the noise of the oil. Low viscosity has the characteristics of fuel saving.

If SAE 10W-30 or higher viscosity oil is used in cold weather, the engine may be difficult to start, so it is recommended to use SAE 0W 20, 5W 20 or 5W 30 oil. Relatively speaking, using 0W-20 engine oil can save fuel to the greatest extent.

Baidu Encyclopedia-Engine Oil 10w-40