I am always using Sunoco Gold 94 octane. And it only happens after using engine break on a downhill. I just changed the oil and the spark plugs. So I think we can rule out pinging. If it was the knock sensor then the noise would be audible every time during acceleration from a standstill, not just after using engine break, I think. Thanks anyways. I will consult with my trusted mechanic.
Alex
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