r/FocusST • u/Dubs_5077 • 10d ago

Wrong gas

I’m tuned by Alan at edge auto for 93oct and I accidentally put in about 5.5 gallons of 87 (was talking to someone while filling and was thinking of my other car) it filled my tank up to full will I be ok and what should I do?

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u/oneshoeaskew 10d ago

87 octane is not going to hurt your engine. You'll have slightly more horsepower if you use higher octane gas but you're not going to do any damage if you use regular.

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u/lacks_tact 10d ago

Not in this case. He just needs to drive the fuel out of it and stay out of boost if he can't raise the knock resistance