Quote:
Originally Posted by SoK
how has the quality of 87 octane fuel changes since 1997?
if porsche recommended 91 minimum in 1997, would that equate to 2012's 87 octane?
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Since octane is a measure of compressibility before ignition, I would seriously doubt a material change. 87 octane in any year ignites at lower compression than 91 octane.
Higher compression engines require higher octane fuel, or bad things start to happen.