Can I Switch from 98 Octane to 95 Octane Gasoline?
2 Answers
You can switch from 98 octane to 95 octane gasoline. Here are the reasons why it's acceptable to use 95 octane after running out of 98 octane: 1. Avoid mixing different octane grades of gasoline. If you previously used 98 octane gasoline, you should continue using 98 octane for your next refuel. In special circumstances, using 95 octane once won't cause major issues, but prolonged use may lead to engine knocking, increased carbon deposits, and higher fuel consumption. 2. Similarly, if you've been using 95 octane gasoline, adding 98 octane once or twice won't have significant impact, but long-term mixing should be avoided. If you want to change gasoline grades, it's best to wait until the fuel gauge light comes on before refueling with the new grade, or directly drain the remaining fuel before switching. Never mix different octane grades directly.
Having driven for over a decade, I have deep feelings about fuel grades. Switching from 98-octane to 95-octane is certainly doable, but the key is whether your car can adapt. 98-octane has higher octane rating and better anti-knock performance. If your car requires high-grade fuel, switching to 95-octane may cause knocking—a pinging or knocking sound from the engine. Knocking isn't just annoying; it reduces power, increases fuel consumption, and can damage pistons or valve systems over time. I suggest first checking your owner's manual—if it specifies a recommended fuel grade, follow it. Alternatively, consult a trusted mechanic. Don't risk damaging your beloved car just to save a few bucks on fuel—safety first. Occasionally testing a tank of 95-octane is fine, but I strongly advise against long-term switching, especially for high-performance cars—don't mess with that.
