Reply to thread

Message: <blockquote data-quote="2wenty6" data-source="post: 518320" data-attributes="member: 20205">The knock sensors will compensate for the fuel quality, you're not gonna toast your engine. On my m50b25, the petrol cap specifies RON 91-98.Whether 97 is better for engine, more myth than fact. May have additional cleaner additives in there compared to 95 of the same brand, but I believe it doesn't make that big a difference.In the US where petrol prices aren't regulated, the difference in price between a name-brand petrol (Philips 66, Shell, etc) vs a budget brand (Loaf n Jug, Kum n Go) is the amount of additives and cleaner in the petrol. Apparently the base stock (i.e petrol) are all the same, what separates them is the brand specific additives.If you really read into what the RON rating actually means (knock resistance), then from that point of view, 97 will be a waste if your engine will not implode on 95. Especially so if you're just daily driving..So much myth and hearsay and very few people bother to find out for themselves..I may not be 100% correct, but using 95 or 97 is within BMW's specification. :top:</blockquote>