Why is there no 97-octane gasoline anymore?
2 Answers
The discontinuation of 97-octane gasoline is aimed at improving fuel performance and enhancing environmental quality. Here's relevant information about 97-octane gasoline: 1. Definition: 97-octane gasoline consists of 97% isooctane and 3% n-heptane. Engines with high compression ratios should use high-octane gasoline. Using low-octane gasoline in high-compression engines can cause abnormal combustion, leading to knocking, increased fuel consumption, and reduced driving power. 2. Standards: The state has strict standards for automotive gasoline. These standards not only require gasoline to have a certain octane number (commonly known as the gasoline grade) but also impose strict regulations on the content of various chemical components in gasoline. If the olefin content is too high, gasoline cannot be completely burned, resulting in a gummy substance that accumulates in the intake manifold and valve guides.
I used to see 97-octane gasoline frequently when refueling, but now it's almost extinct. The main reason is that the country has upgraded gasoline standards. The China VI emission regulations require cleaner fuels, prompting refineries to adjust the octane rating indicators, upgrading 97-octane to 98-octane. This change is driven by the fact that modern engines have higher compression ratios, requiring higher-octane fuel to prevent knocking and ensure more complete combustion, thereby reducing pollutant emissions. For us drivers, using 98-octane is actually better—it's compatible with most older vehicles and can also enhance engine performance and longevity. Occasionally, you might find 97-octane in old gas stations' inventory, but it's not recommended for long-term use as it may affect newer vehicles' adaptability. Once you get used to the new rating, refueling becomes more hassle-free, and you contribute to environmental protection. Overall, this is an inevitable result of technological progress.
