Same here. Mine starts as the engine warms up, not there from cold start, but within less than three minutes it appears. If I'm steady on the throttle in the "rattle zone" it nearly goes away, any change to engine load brings it right back, even slight increase/decrease of throttle.
Yep, that's it. Mine sounds identical.
I'm just going to drive it until it grenades and they come up with a TSB. It's a 3rd car for me so I don't drive it that much.
I have access to 93
WOW that's bad I noticed the car had 12KM how many are on the second motor ? Do you know the production date on the new engine, I would bore scope the cylinders there must be major scuffing with that loud of a piston slap.
When I received the car from the dealer it had 87 octane then I ran that tank out and put in 91 octane no change in rattle. You are correct that all those variables together will set the stage for detonation, however IMO I believe that with today's technology and the use of 4 knock sensors that the timing would be retarded in such an event and prevent detonation. The charge motion plates essentially control air velocity into the cylinders I doubt that would play a factor, but who's I've seen stranger things.
I did not hear this as the manifold was messed as well. Once the manifold was swapped I heard this the same minute I drove away from the dealer....