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.

scoport5
10

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

Question type: Maintenance & Repair

6 Answers

DavidH25
Not Active

No worries. It will do no harm.

4 out of 4 people think this is helpful.
scoport5
10

Thank you!!!

1 out of 1 people think this is helpful.
tennisshoes
20,885

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.
RickELake
625

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

1 out of 1 people think this is helpful.
Michael Tutty
4,475

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.
tommcmanis
3,585

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

1 out of 1 people think this is helpful.
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