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Message: <blockquote data-quote="nerdjack" data-source="post: 374835" data-attributes="member: 18119">Most of the plant set up to process ULG92 and ULG97. They come up with ULG95 by mixing both ULG92 and ULG97 until the octane number become 95. By theory, there will be no problem for the engine designed suitable with ron95. The problem is when your engine deign for ron97 as min requirement and the usage of ron95 will cause a knocking problem.Theres no point of using ron97 if you engine designed to run well with ron95. It will not effect in any performance but a mere thought that your car get more power byusing a powerful RON. No, thats not a real fact.But I cant comment much on new BMW engine. Most of new engines designed for performance. More pressure in engines will produce more torque and power. More pressure in engine will need more RON to cater the process. So its logic that modern engine will show more performance when using ron97. Im new with BMW engine. I read from the forum that the BMW engine have some sort of adaptation ability. I dont know how it works but if it so, the theory that ron97 provide more performance and value is logic. my 2 cents sharing ....</blockquote>