One problem related to coolant leaking has been reported for the 2009 BMW X6. The most recently reported issues are listed below.
I took my 2009 BMW X6 to the BMW dealer, union city GA for 3 purposes: suspected leak of coolant; check engine light on; and excessive smoke coming from both exhaust pipes. Spoke with/communicated via email with BMW svc rep, went over documented concerns. . . To include smoke from both exhaust pipes; received document for approval; which I approved. Received vehicle 3 days later, returning home with vehicle to observe smoke 'excessive' from both exhaust pipes. Returned vehicle, to be told by svc mgr, "I'm sorry, I can only reprimand svc rep, as the work that was done would not correct smoke from exhaust. " then, svc mgr went on to speak of the class action law suit that addressed this problem, but the timeframe to have this corrected (for free) had expired 'by date". . . And this information is usually sent to the original owner. As I expressed to him, I am the 4th owner of this vehicle and received no information. . . He of course was apologetic and gave an estimate of $8k to correct this problem (that I was "told" and paid for would correct the problem). I called hq BMW only to receive an apology and referred to BMW union city. . . To receive a written estimate from the [same] svc manager. *smoke observed wihile vehicle is stationary with engine on; and in motion in both city and on highway. Began 3/16 - 3/31/2020.