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Discussion Starter #1
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Your stock-motor BMW will not see any gains from higher octane than you can get at your local gas station. Don't waste your time or money.

You would have to have a custom-built high-compression engine or forced-induction to see an actual benefit from an octane rating above 102.

- Rob
 

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yeah, don't waste the money, ur bimmer is only require 91 octane, anything above that will not giving u any gain unless u have a compression ratio over 11.5:1
 

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Discussion Starter #5
I remember reading in another post on this forum that the ECU would adapt up to 98 Octane (well at least on the 99 328).

I'm not looking at going over 100 Octane, mind you.

Thanks for the info though.

BabyBlack, in my manual it says that 91 octane is the minimum requirement AND that a higher octane rating will increase performance.

Anyhow, at this rate can't get Toluene in Canada without a license, i'll check for Xylene (mix, no discrimination between o-,m-,p-).
 

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Sofa-king-what
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i had the eml light turned on for some km (lean air/fuel ratio) after adding an octane booster.....

anyway the gain is noticeable (but you can't always add it....isn't that cheap)
 
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