I think that the X5 overall is average when it comes to problems. But i do admit ive owned alot of bimmers and my X5 was the most problematic one iver ever had. My personal opinion is that its because it is assembled in the Usa and not in germany like all my other bimmers were.

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Dinan M3

2006 X5 4.4i Sport Current Vehicle
2006 CLS 55 AMG Current Vehicle
2010 FORD F-450 King Ranch Current Vehicle
2012 GL 550 Current Vehicle

1999 M3 Dinan S3 SOLD
2001 M3 Dinan S2 SOLD
2002 M5 SOLD
2004 X5 4.4i sport SOLD
2007 335 XI Lease ended
2009 E92 M3 SOLD