Yes I've read several things and watched a few youtubes on it. It makes a lot of sense to me that it could be the culprit, so much so that I just went ahead and ordered the DISAs. I can envision when I really romp on the gas that the valve could be moving or getting sucked around in some sort of an imperfect manner, and then not operating or being intact enough to go back into position until the engine is shut off and restarted. Only thing is most of the stuff I have read/watched talks about the presence of some kind of noise, like a grinding, whistling, rattling, flopping/thump, something, which I'm not hearing. I could see where that wouldn't always be the case, though.

Gonna first try switching out coils 1 & 3 (either side of #5 in firing order) to see if the P0305 moves or goes away, and also install the new A/F sensors. Thanks

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2009 X5 3.0
2001 X5 4.4 - Sold