@sbbx5d: In every German car I've owned (Porsche, Audi, MB and BMW), sensors are always an Achilles heal. There are just so darned many of them! Wish I had $100 for every throttle position sensor, steering wheel position sensor, intake temp sensor and MAF (mass air flow) sensor I've replaced over the past 20 years. I don't know if American, Japanese and Korean cars have similar issues, but it is definitely not unique to BMW.
@zz6938: Why do you assume you have a "problem"? There are lots of completely normal fan and relay noises after shut down in every BMW. E.g. the climate control system shutting the vents some 15 to 30 seconds after you power down the car. Happened with my E60, all 3 E70's and my E93. On the X5D, there is probably also a pump that circulates coolant around the turbocharger until the temp drops to a certain level - don't know this for a fact, but I strongly suspect there is.
@Cdnrockies: Sounds like your dealer is forgetting to reset the service interval in your iDrive. Not that uncommon. If you're otherwise happy with the service experience, I would look at it as a minor annoyance - unless they've changed things in the 2011's, it's very easy to go into iDrive yourself and reset.
2011 535xi M Sport
TiAg / Black, ZPP, ZP2, ZCV, ZCW, ZDA, 2TB, 6NR, 465, 5DL, and a Partridge in a Pear Tree
2011 X5 35D
Deep Sea Blue / Oyster, PP, SP, PSP, CWP, Tech, 20" 214's
2008 ///M3 Vert
2008 X5 3.0
2007 X5 3.0
2006 X5 3.0
2006 550iA SP
2003 540iA M-Sport