This is v interesting as since my M3W had its 4000 mile service I too have noticed this "pinging/pinking/tinkling" sound - I do think its some sort of engine mapping issue - as its only on load at high revs. Could it be the ECU "playing" with the ignition?? I think it possibly is. Yesterday on a run I deliberately paused revs on the "tinkling" and then floored it - it disappeared. It is not fuel or pinking.hope this adds to the debate!
