So I finally got around to taking my 330i in for this issue, and today I got a call from my SA that BMWNA does not want to approve the repairs, despite the SIB. I've contacted BMWNA, and they are going to contact the dealer and try to figure it out. What should I do if they come back and still say no? My car clearly has the clatter, sometimes it sounds like a diesel, they are trying to tell me that this is within their spec, and I disagree.

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2010 X5d, Space Gray, Tobacco, Premium, Tech, and rear climate packages, roof rails, spare tire, and iPod adapter.
2006 330i, Sport, 6MT