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The correct octane number (archive)
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Posted by DD on March 29, 2000 at 16:16:27:

In Reply to: waht's the correct octane to use? posted by scottk on March 29, 2000 at 09:57:30:


The correct octane is critical to the longivity of your auto. The owners manual states the correct octane for your engine. I am not sure, but I have heard that using too high of octane may damage your engine. The ignition system has been engineered to fire at specific times, based partly on the octane. If you provide the incorrect octane, it might fire prematurely, resulting in loss of HP.

My 1990 535i uses 87 octane. This number was provided in the owner's manual. Check your manual before wasting money on the premium gas.

"cool blue"
1990 535i

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