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latest update.
drove 1000km. noise persists, but still quieter than what is in those initial videos. additionally the noise doesn't occur at idle, only between 1200-2500rpm, at which point it sounds like it is rhythmic and constantly present, but difficult to discern because of the engine noise.
however, on my last drive on the highway, i cruised at highway speeds in 3rd/4th gear (5000-6500rpm) for several minutes. additionally I did some 2nd and 3rd gear redline pulls. once i got off the highway, i pulled off on a sidestreet next to parked cars and did not hear the noise. maybe there were one or two clicks, but it was essentially gone. the condition remained when I got home.
this weekend i took a 600km roadtrip (300k each way). at my destination, the noise was present. i then drove around in 2nd gear, cruising at 5000-7000 rpm for 2-3 minutes. i then checked the noise and it was gone.
so, it seems that high rpm (and thus high oil pressure) temporarily quiets the noise. which leads me to believe that it is either vanos related, or lifters are not fully lubricated under low oil pressure conditions.
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