BMW recommends regular gas for winter??? Any truth about that??

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Jun 10, 2006 | 04:33 PM

#11

ImolaRedM

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From: Seattle, WA Metro Area

Quote:

Originally Posted by bbrase' post='295712' date='Jun 10 2006, 07:59 PM

Read this article, BMW says to use pemium 91 AKI which equates to 87 octane in the US (R+M)/M2 method.

http://en.wikipedia.org/wiki/Octane_rating

Read the Wiki closer... 91 AKI is 91 (R+M)/2. I think you're thinking of 91 RON = ~87 (R+M)/2. So when BMW states to use 91 AKI in the US they're talking our measure of octane not what's used in the EU. Your best bet is to use 93 Octane fuel in the US. It's about equal to the EU's 97 RON fuel.

Jun 10, 2006 | 04:34 PM

#12

Blah

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My Ride: 06 530Xi w/ M-Sport Package 07 335i Cabriolet w/ M-Sport body kit

Quote:

Originally Posted by nickolas_g' post='295717' date='Jun 10 2006, 08:21 PM

Is there any information on how "clean" gas at different octane burns? Does one grade leave more deposits than another as most marketing would suggest?

Octane number is a measure of how well the fuel mixture resists knock; it has nothing to do with how complete it burns or how much deposit it leave.

Nonetheless oil companies often put more detergent additives in higher octane fuel, advertise it as engine cleaning fuel, to encourage you to buy it and give them more profit.