what to do if i put the wrong gas in my car


Asked by Nov 23, 2015 at 02:05 PM about the 2008 BMW 3 Series 328i

Question type: Maintenance & Repair

wrong grade of gas put in, car is running bad, is it coincidence or gas is
affecting it.  What do i need to do?

6 Answers


I would live with the problem until it is down to a half tank and then top it off with premium. If you are worried about it add some octane booster like this ----

3 out of 3 people think this is helpful.
Tom Demyan

If it still continues to not run correctly after you try the above, you might have another issue. How many miles on the car? Any lights lit up on the dash?

1 out of 1 people think this is helpful.
Kelly Mayo

what gas did you put into in by mistake and what is the recomended grade/ octane....and does it rattle only under a load????

Bob Beaman

Grade of gas is not likely to make a noticeable difference unless you put your foot deep into the gas pedal. I would think you likely have other issues.

1 out of 1 people think this is helpful.

Yeah, a lower octane gas is not gonna cause immediate problems- how long since you had a major service on that Bimmobile?

1 out of 1 people think this is helpful.

You likely won't have an instant problem because of the gas being too low octane, but you should probably just add in premium gas. Octane booster wouldn't hurt, either. Heck, you could probably throw in a bottle of fuel treatment/cleaner, too, because depending on how long it's been since your last treatment, that could be an issue here.

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