I mistakenly put 87 octne fuel in my tank for my BMW 325ci - I usually put 93 octane in it. Will this damage my engine - the tank was .25 full before I put in the lower octane gas.


Asked by scoport5 Jul 23, 2013 at 03:21 PM about the 2003 BMW 3 Series 325Ci Convertible

Question type: Maintenance & Repair

6 Answers

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No worries. It will do no harm.

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Thank you!!!

1 out of 1 people think this is helpful.

David is right 1 tank shouldn't be a problem but if you are worried just put in some good octane booster.

3 out of 3 people think this is helpful.

no harm done - just don't make a habit of it or your engine will start pinging....

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Michael Tutty

Your engine will start pinging as soon as the high octane in the lines is burned off, which won't be long. You will also find that the computer retards the timing to stop this, and the timing will retard so far that the car will barely run, will have little power and will burn gas like a road warrior. Add octane boost now, and then at the 3/4 tank mark, top up with the super-high, 94 octane, or what ever the highest is you can get. Do that for a couple of times, and then go back to your normal grade of fuel. At the price of a replacement engine, it is better to take no chances on causing damage.

1 out of 1 people think this is helpful.

Cheap fuel wont hurt it at all poor performance is all and crappy mileage

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