What is the difference between 0w-40 and 5w-40?

[DelKylie]

0W-40 and 5W-40 mainly differ in their resistance to external low temperatures. The 0W in 0W-40 oil represents a resistance to external low temperatures of -35°C, while the 5W in 5W-40 oil represents a resistance to external low temperatures of -30°C. The smaller the number before the W, the better the low-temperature performance, so the only difference between 0W-40 and 5W-40 oils is a 5-degree difference in supported low-temperature fluidity, with no other distinctions. Below is some relevant information: 1. For 0W-40 and 5W-40, the smaller the number before the "W," the better the oil's low-temperature fluidity, indicating a lower usable environmental temperature. 2. The number after the "W" is an indicator of the oil's high-temperature resistance. The larger the number, the better the oil's protective performance at high temperatures. The 40 indicates that when the engine temperature is 100 degrees Celsius, the oil's kinematic viscosity is 12.5-16.3. 3. The grade of engine oil is determined by its quality level and the kinematic viscosity grade at 100 degrees Celsius.