With Rennlist, make sure you read "Coolant pipes A-Z" and as many posts as you can by the member who calls himself a "Board Certified Porsche Trauma Surgeon, Cayenne Grief Counselor." Always entertaining and informative.

The three C's - Coolant pipes, Coils, and Cardan shaft (all depending on year/model) are common items based on the limited research that I did. But Rennlist has much better info than my memory can provide at this point.

Sounds like a fun adventure. You've proven yourself capable of dealing with whatever an X5 can throw at you, so why not a Cayenne?

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2016 GMC Sierra 2500 HD All-Terrain, Duramax 6.6

2011 X5M Alpine White/Sakhir Orange, Eucalyptus, Spare tire!, Comfort, Soft Close, Tech, Rear Climate, Individual dash, Individual Audio, HUD, DVD, USB, Cold.

Gone:
2008 4.8i
2005 X5 4.8is
2004 X5 4.4i Sport
2004 X3 3.0i 6MT
2002 M5