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Message: <blockquote data-quote="MRsamdol" data-source="post: 661137" data-attributes="member: 2297">Should be a non issue but on my s65 i have experienced some knocking on full accelaration. Search online for answers and the gist of what i found is that if your engine is used to ron 97 that it will knock at higher revs if you put ron95 but....your ECU will adjust the ignition timing to avoid the knocking. Downside to that is you will not get the published bhp as manufacturers specs as they will use ron97 or higher. So basically you will lose the power as compared to using 97. Anyone else have any other explanations? My research online is with my s65 engine.</blockquote>