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Octane Rating (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by Ghassan Shaheeb on January 07, 2001 at 20:01:28:

Hi,
Does anyone know why BMW insists on uning high octane grade fuel (to be precise 91 Octane) when in fact engines like the ones on E34 535i and 525i employ a compression ration of 9.5:1?

Isn't it 87 or 89 octane should be sufficient for this compression ratio?

Please explain me this mystery.

1990 535iM.
Thank you.

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