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lower octane gas (archive)
[ Follow Ups ] [ 8-series (E31) Message Board ] [ Msg. Board FAQ ]
Posted by Lez on August 21, 2000 at 11:22:57:

In Reply to: Re: Only after three hot-soaks within one hour. posted by Stan C. on August 21, 2000 at 09:04:27:

The compression ratio in the pre-93 850i is 8.8:1 so very low, it is still require a high octane ? I always thought the lower compression means lower octane. I run premium (93) on my 840Ci because the compression ratio is high 10:1 but the manual says I can run on 91 octane.
Somebody also said here a few months ago, if you run on higher octane you damage the engine...
I found it hard to belive but interesting theory



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