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Message: <blockquote data-quote="wanalimi" data-source="post: 377936" data-attributes="member: 9466">Add a bit..Frens... E34 is old. 13~21 yrs owl olready. There must be lots of carbon deposits inside the block, pistons and valves. RON IS A MEASURE OF THE ABILITY OF A  FUEL TO RESIST KNOCK, OR EARLY FIRING DUE TO COMPRESSION & HEAT. Carbon (arang) itself is flamable. So carbon deposit will help combustion in the block gone beyond control, normally earlier than that of your spark plug. So combines with fuel, it fires itself before your piston reach the top most, where the spark plug is just to fire. When this early fire happens, it would push down the piston that is still suppose to be moving up. This will make you feel jerk from your engine, because it is forced the opposite way while the piston is not yet finished its cycle. This is called KNOCK.So frens, maybe you could consider a top overhaul, which might cost up to RM1500, or else you have to fork out extra for higher RON fuel with deteriorating effiency every time at petrol station. A computer diagnose with knock sencor faults out would confirm this. So actually, as long as u put in fuel equivalent or higher RON than that of the minimum of what original spec said, u'll get what originally promised. RON doesn't show flamability or HP. In contrast, by the definition, higher RON might means more difficult to start burning. So how can you get more HP on higher RON fuel?Why sports car engine need high RON? It's simply because they are of high compression ratio and high rev.</blockquote>

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