Can I Add 95 Octane Gasoline to a Tank with 92 Octane Gasoline?

1 Answers
Luke
07/29/25 7:17pm
If there is 92 octane gasoline in the fuel tank, it is best not to add 95 octane gasoline. Mixing 92 octane and 95 octane gasoline should be avoided as much as possible. Adding 95 octane gasoline to a tank with 92 octane gasoline occasionally will not cause problems. However, if 92 octane and 95 octane gasoline are mixed for a long time, the high anti-knock performance of 95 octane gasoline cannot be fully utilized, and delayed combustion may occur. The ultimate consequences of this phenomenon include incomplete combustion, increased carbon deposits in the engine, potential engine damage, environmental pollution, and resource wastage. Since parameters such as the engine's compression ratio and ignition timing are preset in the engine's computer, car owners should strictly follow the requirements in the user manual when selecting gasoline. Higher octane gasoline is not necessarily better, and blindly using high-octane fuel should be avoided. The differences between 92 octane and 95 octane gasoline mainly lie in their octane ratings, anti-knock performance, and price. 92 octane gasoline consists of 92% isooctane and 8% n-heptane, while 95 octane gasoline is composed of 95% isooctane and 5% n-heptane. Gasolines with different octane ratings have varying octane values—the higher the octane rating, the higher the octane value, and the better the anti-knock performance. 95 octane gasoline is more expensive than 92 octane gasoline because it contains a higher proportion of isooctane. Each engine undergoes comprehensive evaluation before leaving the factory, and based on its performance and other data characteristics, the required anti-knock performance—and thus the appropriate octane rating—is determined.
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