Quote:
Originally posted by B. Elliott
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.
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I'd say to try a small amount of 87 first, there is, after all, some variation between engines, even when mass-produced and age increases those variations. My dad had an Explorer with the Ford 302 V8, specs called for 87, but it would ping when hauling/towing with anything other than 91+, so we just always ran 91 (no-one could find any issues with the engine, so we just chalked it up to production variances).