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I too have noticed this knock/ping type sound on my 08 E92 that I picked up about 6 months ago. Light load, heavy throttle application (60-80% throttle in a lower gear, at around 2-3000rpm). It doesn't seem to change at all with the type of gas I fill up with. I'm scheduled for an oil change soon and will get them to take a look, but I'm expecting them not to hear anything. Should be fun.
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