What grade of gasoline should a BMW X7 use?

[OBethany]

BMW X7 recommends using 98-octane gasoline. 98-octane gasoline has higher purity and better anti-knock performance, which can better promote the engine's internal work. Here is some additional information: 1. Differences in gasoline: The main difference lies in the content of n-heptane and isooctane. 92-octane gasoline contains 92% isooctane and 8% n-heptane, while 95-octane gasoline contains 95% isooctane and 5% n-heptane. 98-octane gasoline is a mixture of 98% isooctane and 2% n-heptane. Additionally, the gasoline octane rating represents the fuel's anti-knock performance—the higher the rating, the better the anti-knock performance. 2. Precautions: Try not to wait until the fuel light comes on before refueling. Because the fuel pump is located inside the fuel tank and operates at a high temperature continuously, being immersed in fuel helps to cool it effectively. When the fuel light comes on, it indicates that the fuel level is below the fuel pump. If you always wait until the light comes on to refuel, it will shorten the fuel pump's lifespan. Having too little fuel or running out of fuel could even burn out the fuel pump.