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 Sedan RWD

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

86,905

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 of 3 people found this helpful.
264,615

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 of 1 people found this helpful.
28,095

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

55,485

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 of 1 people found this helpful.
24,045

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

1 of 1 people found this helpful.
1,715

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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