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Message: <blockquote data-quote="haywire" data-source="post: 516124" data-attributes="member: 16474">Recent conversation with our members here who works in the oil and gas business, the 95 and 97 came from the same refined petrol from Petronas or Shell (only 2 brand refineries here even the esso and others are using these fuels) To make it 95 or 97 they add in the subsequent mixtures/additives to make it 95 or 97. Not an expert here but thats what I heard, could be talking complete rubbish here. Somebody please tell me.Also these 95 and 97 thingies refer to the knocking properties, your car has knock sensors, which will alter the way the engine is run based on the type of Ron. My car at least says I can use Ron91-98, I tend to believe what BMW says rather than some rumours.</blockquote>