At what percentage of oil life should a Buick car's oil be changed?

[StLillian]

Below 10%. The oil life reminder is a result calculated by the vehicle's computer based on various factors such as usage time, mileage, engine speed, etc. When the remaining oil life drops to around 10%, the vehicle's instrument cluster will display a prompt to change the oil promptly. Here is some relevant information: 1. By this time, the old oil may have deteriorated, losing its original lubrication and cooling effects, and prolonged use could lead to severe wear on some engine components. Since the data remains fixed, it's still necessary to decide based on actual conditions. 2. First, observe the color of the oil. If it has darkened significantly compared to before or shows obvious impurities floating on the surface, it indicates that the oil can no longer be used and needs to be replaced. Second, you can rely on your driving experience to judge. If you notice significant engine vibration and increased engine noise, it's time to visit a 4S shop for an oil change as soon as possible. Of course, a more scientific method is to use oil test paper to determine whether the oil needs to be changed.