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Adding a higher octane fuel than is required can not possibly cause any such problems. In any case that sound is not pinking or pre-ignition, which is what you get from too low an octane fuel; nor does it quite rattle enough to be tappets. That still leaves plenty of alternative causes for the noise, some of which involve expensive repairs, so I suggest you get it examined professionally before permanent damage is done.1 point
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I don't think the petrol ones will change it much. I'm with the others on this and a backbox delete, it won't make it too loud either. IV found this video on YouTube which has a a4 diesel with the backbox delete: Hope it's useful :) Cheers, and merry Christmas :) Steve1 point
