Do I Need to Empty the Tank When Switching from 92 to 95?

[DiJonathan]

When switching from 92 to 95, the tank should be emptied. Although both 92 and 95 octane gasoline use the same base oil, the proportion of anti-knock agents differs. Mixing them can lead to engine knocking, insufficient power, carbon buildup, and other issues. Here are detailed explanations: 1. Explanation one: With equal amounts of 92 and 95 octane gasoline, the mass of sediment produced by both grades shows no significant difference, indicating that higher octane gasoline does not produce less carbon buildup than lower octane gasoline. 2. Explanation two: Manufacturers determine the fuel grade based on China's fuel quality and road conditions through testing and practical experiments.