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Message: <blockquote data-quote="Schwepps" data-source="post: 396964" data-attributes="member: 3592">Glock, I think you're too young to have heard knocking before. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> You WILL hear it, and even feel it, if your engine knocks. Uncle like me used to drive old manual cars at your age, and sometimes the wrong gear was chosen and the engine would go plink-plink-plink. The anti-knock sensor is actually a peizo microphone, so if you can't hear it, neither can the sensor.If your car doesn't knock with 95, it's even sillier still to pay 25 sen more for 97 and get exactly the same power.The manufacturer doesn't 'test' on 98, it designs the engine timing to operate at 98. In engineering, there is always an allowance built in and the allowance for modern engines is wide. As the slides show, don't think that when they sell you 97, it's EXACTLY 97.  It definitely won't be, and will only be 'around' 97.Of course BMW would prefer you to use the design target of 98. Just like they prefer you to use fully synthetic oil with LL-01, RFTs with 36/40 psi, and only BMW parts, even for windscreen washer fluid. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></blockquote>

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