My 2008 X5 had the same issue when the gaskets failed. I immediately did a coolant and oil change. This is an easy easy repair. You may need to loosen the intake manifold to get at the bolts. Its a total of 6 Etorx bits for removal of the housing and the cooler. Replace them both at the same time. Itll save you the headache in the future. Im pretty sure this is a similar job as with the N52 to N54/55 Engine. Correct me if I'm wrong guys.

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2010 X5 3.0 X-drive Titanium Silver/Black
2018 Ford F-150 Platinum Crew
2010 528xi (His)
2017 M2 Manual (His)

Former Headaches:
2008 X5 RIP
2015 M235
2013 135is
2009 535xi Wagon (JUNK)
2007 530xi 6spd CPO Sport (Best Damn Car EVER)
2011 335xi M-sport Coupe 6spd (Sex on Wheels)
2010 550GT "CPO" (Junk)
2012 X5 35d "CPO" (More Junk)
2004 330i ZHP Sedan
2002 325xi Wagon
2000 323i Sedan
1998 M3 Sedan
1992 325i Sedan