What is the difference between Castrol 0W and 5W?
1 Answers
The difference between Castrol 0W and 5W lies in their low-temperature viscosity and cold resistance. Difference in low-temperature viscosity: The distinction between the two lies in their low-temperature viscosity, which refers to their low-temperature fluidity. The "W" stands for "Winter" in English, and the number preceding it indicates the oil's low-temperature fluidity. The smaller the number, the lower the low-temperature viscosity of the oil, meaning it has better fluidity and greater cold resistance. Therefore, the difference between 0W and 5W oil is that 0W has better low-temperature fluidity than 5W. Difference in cold resistance: Additionally, the cold resistance of 0W and 5W oils differs. Generally, 0W oil can withstand temperatures as low as -35 degrees Celsius, while 5W oil can only handle temperatures down to -30 degrees Celsius. As oil becomes more viscous with decreasing temperatures, the resistance during engine startup increases. If oil with poor low-temperature fluidity is used in extremely cold conditions, it may result in weak engine startup or even failure to start the car engine.