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My 91 525i owners manual states 91 octane. and if (archive)
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Posted by pete on January 07, 2001 at 20:40:32:

In Reply to: Octane Rating posted by Ghassan Shaheeb on January 07, 2001 at 20:01:28:

i use anything less it runs like crap!


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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