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Octane issue - personal experience. (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by Oleg on August 26, 2001 at 23:39:45:

I used to run 87 - regular but lately noticed a slight detonation on high rpms and heavy load. Over last few weeks I made a lot of highway driving with fast acceleration and this detonation started being very annoying. I poured premium to the top and all the detonation vanished. Last week I tried Silver or 89 still no detonation. I think I will stay with it.

89 525iA 219,xxx Mi (stock chip)

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