Quote Originally Posted by timetorelax View Post
Mine is definitely pinging now whoops I mean post-combustion detonation . I definitely did not hear it from new but I started to hear it after hitting 6000km on the clock. It's pretty obvious when the engine is reving around 2500rpm in 5th gear before changing down on a hill. At the moment I'm not too worried but I guess I should notify Honda.
That sounds exactly the same as mine now. I only started to hear something around the 5,000 k mark. (Mine is a manual by the way) Mine sounds like a metallic rattle, almost like a cam chain rattling or something. (I know thats not what the noise is, just trying to describe the sound)

I found that my car was worse for both economy and rattling noise when I used Etahnol blended 95 octane petrol