I read your posts with interest, John.
I have experienced this issue from very early on in the ownership of my 2022 P4. Although the issues related to clonking in my case relate to the splined output shafts and wheel hubs (or so I was told), I am suspicious now, having read your detailed post, that there is much more going on.
Having undertaken research into the right grease (high temperature molybdenum infused grease) for the splined shaft/hub, which certainly seems to have quietened down the immediate clonking, there is no doubt that accelerating and decelerating at modest urban driving speeds, the drive and transmission are best described as 'jerky'. It is far from smooth and requires gentle throttle application to avoid excessive jerkiness and an in cabin audible clonk.
My big question related to all this though is why this isn't being picked up when the cars are serviced? I have mentioned it every time my car has gone in and been informed it was down to the splines of the wire wheels / shafts. I suspect now that this isn't the real root cause, a contributory factor yes, but the whole story, no.
Finally, and back to the original question raised in this post. I have experienced a seriously bad squeaking noise from the suspension struts. This has manifested since having Nitron's fitted, which hugely improve handling and ride quality. My suspicion was that the bearing surfaces between the bolts and suspension bushes were running dry. This has now been confirmed and is being widely reported by cars with Nitron retrofit. It seems that the bolts and bushes require re-greasing when the car is serviced. Just something to bear in mind if considering Nitron's. Inconvenient yes, but still worth it.
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