What is the difference between Castrol 0w40 and 5w40?

1 Answers
RowanAnn
07/29/25 4:27pm
Castrol 0w40 and 5w40 mainly differ in their applicable temperature ranges: 1. The numbers 0 and 5 represent the minimum applicable temperature of the oil, or its low-temperature fluidity. 2. 0 indicates that the minimum applicable temperature of the oil is -35 degrees Celsius. 3. 5 indicates that the minimum applicable temperature of the oil is -30 degrees Celsius. Additional information: 1. Grade: Both 0w40 and 5w40 are oil grades. The letter W stands for Winter, and in fact, oils with the W letter are all-season oils suitable for both winter and summer. 2. Numbers: The number 40 represents the high-temperature viscosity grade of the oil. The higher the number, the stronger the high-temperature viscosity of the oil, the thicker the oil film, and the better the sealing and protective capabilities. 3. Performance consistency: If the lowest winter temperature of the vehicle is above -35 degrees Celsius, the performance of 0w40 and 5w40 in the vehicle will be essentially the same.
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