Viscosity and engine oil are divided into single viscosity engine oil (such as SAE30) and multi-viscosity engine oil (such as SAE5W-30). At present, most vehicles use multi-viscosity engine oil, because this kind of engine oil contains a variety of special additives, which makes the engine oil easy to flow and not condense at low temperature, and keeps its viscosity unchanged at high temperature.

W in the oil label indicates winter, and the number before W indicates the low-temperature fluidity of the oil. The smaller the number, the better the fluidity of the oil. Engine wear is mainly concentrated at the moment of cold start, and good oil fluidity can minimize engine wear. The number after W indicates the high temperature viscosity of engine oil, and the larger the number, the better the protection performance at high temperature. In addition, the choice of oil viscosity must also consider the old and new degree of the car. The gap between engine parts of new cars is very small, so the oil with low viscosity should be selected, and the oil with high viscosity should be selected for vehicles with serious engine wear.

Viscosity grade temperature range

0W - 50 -35℃ - 50℃

5W - 30 -30℃ - 30℃

0W - 30 -25℃ - 30℃

15W - 40 -20℃ - 40℃

20W - 50 - 15℃ - 50℃

30 0℃ - 30℃

40 10℃ - 50℃

50 20℃ - 50℃