Sounds like he over oiled and/or installed a wet filter on his car. That, and foam filters have always been garbage in my opinion, but the guys overseas do things I find irrational, like dyno with the hood down
https://f30.bimmerpost.com/forums/sh....php?t=1830358
Oil thread here doesn’t indicate any high amounts of insolubles in the oil of anyone with an intake, and they are actually lower than the universal average. I would assume this is a one off, since many people have installed inlets, and this isn’t a common image.
The sound and throttle response, not even the power increase (which is there) was enough for me to take my intake over the stock box/paper. But to each their own.