What are the effects of using 92-octane gasoline in a BMW 3 Series?

[VonJoel]

Using 92-octane gasoline in a BMW 3 Series can easily damage fuel system components and cause engine mixture faults. Below is an introduction to different gasoline types and selection considerations: Differences between gasoline grades: The main difference between 92 and 95-octane gasoline lies in the proportion 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. The higher the proportion of isooctane, the better the anti-knock performance. For example, if 92-octane gasoline is used in a car that originally requires 95-octane, no major issues will occur in the short term. However, prolonged use can lead to engine knocking (especially noticeable at idle), increased carbon deposits in the engine, and higher fuel consumption. Gasoline selection considerations: Avoid mixing different grades or types of gasoline, and strictly prohibit mixing with other fuels to prevent affecting normal engine operation. Do not use deteriorated gasoline that has been stored for a long time, as it has severe gum formation and reduced octane number, which can impact engine performance. Refuel promptly when the fuel warning light comes on. The bottom of the fuel tank contains more water and impurities, which can affect normal engine operation, especially for fuel-injected gasoline engines, reducing the service life of the fuel pump and injectors and easily causing fuel line blockages.