What is the difference between 5W and 10W?
2 Answers
The differences between 5W and 10W engine oil are: 1. 5W engine oil has better low-temperature fluidity than 10W, making it easier to start in cold environments. 2. 5W engine 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 engine oil has stronger cold resistance than 10W. Here are the detailed explanations: 1. Both types of engine oil can be used in various regions in the south, but in the northern winter, 5W can only barely be used in some areas, while if 10W engine oil is used, the engine may experience various issues such as failure to start. 2. Overall, the performance of 5W is better than that of 10W, but car owners must remember to choose engine oil based closely on local weather conditions. After all, apart from the performance difference, 5W engine oil is also relatively more expensive than 10W.
I think the main difference between 5W and 10W lies in the low-temperature fluidity of the oil. 5W oil flows faster during winter starts, remaining smooth even at -25°C, while 10W becomes thicker at similar low temperatures, starting to thicken around -20°C. This affects cold morning starts—5W reduces engine wear and ensures smoother starts, especially in northern regions. In summer or warmer weather, 10W performs well, offering more stable viscosity, which may suit older engines. The choice depends on your car manual's recommendations and local climate. For frequent use in cold regions, 5W is the preferred option, saving fuel and preventing freezing. Remember, the 'W' in oil grades stands for winter performance—the smaller the number, the thinner the oil. Don’t mix up the grades. With over a decade of driving experience, I prioritize matching oil to the vehicle model and environment during oil changes—a habit that keeps engines healthy.
