Can You Add 95 Octane Gasoline When There's Still 92 Octane Left in the Tank?
2 Answers
92 gasoline unused can add 95, but don't do this frequently, occasionally is no problem. Here is the relevant information: 1. Reason: The chemical composition and other aspects of 92 and 95 octane gasoline are relatively similar, both have strong anti-knock properties, and mixing them generally won't cause major issues. However, to ensure vehicle safety, it's best to use them separately. 2. Difference: 95 octane gasoline contains a slightly higher proportion of anti-knock agents compared to 92 octane gasoline. The quality of both types of gasoline is exactly the same, the only difference is the amount of anti-knock agents added, designed to meet the different anti-knock value requirements of engines with varying compression ratios.
I once added 95-octane gasoline when there was still half a tank of 92-octane fuel left in my car. That day, I was in a hurry for a business trip, and the gas station didn’t have 92-octane available, so I had to make do with 95. After driving a few hundred kilometers, the car started and accelerated smoothly without any abnormal reactions. I asked an experienced driver friend about it, and he said mixing gasoline isn’t a big issue because the engine automatically adjusts fuel injection and ignition timing—different octane ratings don’t affect basic performance. However, he also warned me not to make a habit of it. Doing it occasionally is fine, but long-term mixed usage might lead to increased carbon buildup in the engine or slightly higher fuel consumption. He advised me to use up the mixed fuel as soon as possible and switch back to the same type next time. Car manuals usually recommend sticking to one type of gasoline, but after that emergency situation, I felt it was an acceptable temporary solution.
