Difference Between 5W and 10W Engine Oil?
2 Answers
5W and 10W refer to low-temperature viscosity, and the smaller the number before the W, the better the low-temperature fluidity of the oil, the lower the minimum applicable temperature, and the stronger the cold resistance. Here is the relevant information: 1. Fluidity: 5W oil has better low-temperature fluidity than 10W, making it easier to start in cold environments. 2. Temperature: 5W oil can be used at a minimum temperature of -30 degrees Celsius, while 10W can only be used at a minimum temperature of -25 degrees Celsius. 5W oil has stronger cold resistance than 10W. Both types of oil can be used in various regions in the south, but in northern winters, 5W can barely be used in some areas, whereas using 10W oil may cause issues like the engine failing to start. In northern winters, it is advisable to choose 0W oil, which better meets the engine's requirements.
I've been driving for over a decade, and I think the difference between 5w and 10w oil mainly shows up in cold weather. 5w can start smoothly even at -30 degrees Celsius in winter, and the engine sounds very smooth. 10w performs okay in less cold places, around -15 degrees Celsius, but when temperatures drop lower, the startup is a bit slower, and the lubrication can't quite keep up. In summer, both perform similarly under high temperatures and can protect engine components. However, if your car often runs at high speeds, 10w might be slightly more stable, but for regular driving, the difference isn't significant. The key is to avoid choosing the wrong oil, as a slow cold start can increase fuel consumption and wear, leading to higher repair costs in the long run. I've also checked the manual when changing oil to see which type the manufacturer recommends—most new cars are better suited for 5w.
