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.

20

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

Question type: Maintenance & Repair

8 Answers

No worries. It will do no harm.

4 out of 4 people think this is helpful.
20

Thank you!!!

2 out of 2 people think this is helpful.
89,035

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.
1,525

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.
8,265

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.

2 out of 2 people think this is helpful.

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

1 out of 1 people think this is helpful.

All that say poor performance or poor mpg if you use a lower grade gas are incorrect. There has been thousands of test proven that higher octane is a gimmick and only required if you're going to the race track.

89,035

MDX, tell that to my Cadillac, I've tried running both regular and premium fuel in it and there is a 3 mpg drop in mileage and you really notice the drop in power especially in city driving, so I'm sticking with the good stuff in it. Now my Yukon doesn't seem to matter also I've ran both fuels in it and there is no change in mileage or power, even though it is a bigger engine it just does not require higher octane to achieve its maximum output. So there is a differance in fuels and a differance in engines that make fuel requirements stated in the owners manuals. If you follow those guidelines then there won't be any concerns with pre ignition problems or loss of power. And this thread is over 3 years old.

Your Answer

Add photo

Related Questions

3 Series

Looking for a Used 3 Series in your area?

CarGurus has 34,812 nationwide 3 Series listings starting at $900.

ZIP:

Search BMW 3 Series Questions

BMW 3 Series Experts

#1 Tom Demyan
Tom Demyan
Reputation 4,460
#2 Robert Charlson
Robert Charlson
Reputation 1,510
#3 Matt Mankinen
Matt Mankinen
Reputation 1,160
View All

Related Models For Sale

Used BMW 5 Series
506 Great Deals out of 14,759 listings starting at $1,375
Used BMW M3
63 Great Deals out of 1,901 listings starting at $6,999
Used Mercedes-Benz C-Class
542 Great Deals out of 30,629 listings starting at $1,000
Used Audi A4
199 Great Deals out of 10,847 listings starting at $1,333
Used Ford Mustang
333 Great Deals out of 45,523 listings starting at $2,000
Used Honda Accord
700 Great Deals out of 83,203 listings starting at $500
Used Mercedes-Benz E-Class
478 Great Deals out of 22,629 listings starting at $1,999
Used BMW X5
385 Great Deals out of 15,930 listings starting at $1,300
Used Chevrolet Camaro
149 Great Deals out of 34,915 listings starting at $1,995
Used BMW 6 Series
81 Great Deals out of 3,315 listings starting at $4,500
Used BMW 7 Series
186 Great Deals out of 6,184 listings starting at $2,999
Used BMW 1 Series
60 Great Deals out of 1,375 listings starting at $6,499

Used Cars For Sale

2017 BMW 3 Series For Sale
55 Great Deals out of 8,303 listings starting at $28,476
2016 BMW 3 Series For Sale
168 Great Deals out of 3,892 listings starting at $19,995
2015 BMW 3 Series For Sale
17 Great Deals out of 890 listings starting at $16,995
2014 BMW 3 Series For Sale
196 Great Deals out of 4,166 listings starting at $11,980
2013 BMW 3 Series For Sale
165 Great Deals out of 3,515 listings starting at $11,950