Quote:
Originally posted by AaronM
Factory recommendation is in RON, not US AKI. RON 92 = US AKI 87. US is (RON+MON)/2 and is typically equivalent to a Euro rating 5-6 points higher.
I ran 87 octane in my '89 944 NA (10.9:1 CR) and it didn't ping at all. Also did just fine on mileage.
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Well, looks like i'll have to dip down to some 87. I was never aware of the octane rating differences. I thought Porsche would have listed it in AKI for the US owners manuals... guess not.
