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Unread 02-28-2012, 07:32 PM   #1
luna 15

Name: luna 15
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Your Ride: 2002 525i touring M sport

Was wondering if using 89 octane for my M54 would not be a good idea. For octane in my area the choices ar 87,89,93. The manual say 91 which is rare in my area
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Unread 02-28-2012, 08:35 PM   #2
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Name: DEATH2000
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Location: Calgary, Alberta
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Your Ride: 1998 E36 328i sedan
If the manual says 91, use 91 or higher. My manual says to use 89 octane or higher. I use 91 though. Most people use 91 octane in their cars. If you only have 93 then that will be fine too.


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Unread 08-11-2012, 11:42 AM   #3

Name: jmill90
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about fuel choseing fuel

I have a 91 525I and I put 93 in it. I found that if I put a lower grade in it I lost fuel economy.but since the 93 has more carbon when burnt I use lucas fuel injector cleaner its about $10 a bottle but u put it in every time u fill up and it keeps everything clean.
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