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Re: Octane Rating (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by Ghassan Shaheeb on January 07, 2001 at 23:15:27:

In Reply to: Re: Octane Rating posted by Gordon on January 07, 2001 at 20:35:06:


First of all thanks for your input.

My car is a 1990 535i M. The manual states a compression ratio of 9.0:1. The manual's specification's section does say what kind of gasoline but on Page 58 says:

"Your BMW is designed to operate with unleaded fuel with Anti-Knock Index of 87 AKI. This designation is comparable to Research Octane Number 91 RON."

What are they really recommending: to use or not to use 87 octane.

I currently use premium 92 octane. However it runs fine on 87 and 89 octane.

I live in Montreal Canada, may be the gasoline is different.

Please comment.

BMW doesn't recommend premium fuel..they recommed "regular unleaded"... although I always use midrange ... am waiting to use premium when I chip it.




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