What is the difference between 5w40 and 0w40?
2 Answers
The differences between 5w40 and 0w40 are as follows: 1. Different working capabilities in low-temperature environments. 5W oil can ensure normal vehicle startup in temperatures as low as -30 degrees Celsius, while 0W oil can function normally at -35 degrees Celsius. 2. Different low-temperature fluidity. 0w40 has lower low-temperature fluidity compared to 5w40. The '0' indicates that the oil remains liquid at -40 degrees Celsius, and it will solidify below -40 degrees. The '5' means the oil stays liquid at -35 degrees Celsius and solidifies below -35 degrees. Here are some considerations for choosing engine oil: 1. When selecting oil, car owners should consider the highest and lowest temperatures in their local area, the vehicle's grade, and its condition. Using oil with excessively high viscosity will increase movement resistance and affect engine power. Conversely, oil with too low viscosity may not provide adequate lubrication, leading to increased engine wear. 2. For engines that are already significantly worn with larger component clearances, a higher viscosity grade oil can be chosen to enhance the sealing performance of the components.
As a veteran car owner living in cold regions for years, I'm particularly sensitive about motor oil choices. The difference between 5W40 and 0W40 mainly lies in the number before the W: The 5 in 5W40 indicates it flows slightly slower at lower temperatures, remaining usable down to about -25°C, while the 0 in 0W40 means it maintains fluidity in even colder conditions like -30°C, reducing engine friction and noise during cold starts. The 40 suffix is identical - both provide equivalent high-temperature engine protection. I typically use 0W40 in northern winters for quicker starts and slightly better fuel efficiency, then switch back to more cost-effective 5W40 in summer. My advice: choose based on your local temperature - 0W40 for extreme cold regions, 5W40 suffices for moderate climates (no need to overspend). Always consult professional mechanics during maintenance checks.
