pjchawaii 
2008 BMW X5 SUV 4.8i 4dr SUV AWD (4.8L 8cyl 6A)
Love the X5 but lots of serious issues
 So I've had 4 BMWs in the past 5-6 years and overall really love the brand.  Unfortunately the purchase of my X5 has tarnished my otherwise positive view of build quality.   
 Generally I lease vehicles, but this I chose to purchase with the idea of keeping it for 6-8  years figuring I could justify the $80,000 price if amortized over those years.  
 The X5 has a lot of complex things about it so I wasn't foolish to think it would be a low maintenance vehicle - but didn't expect :  at 39K miles - New A/C ($3500) - New rear struts ($2000), & now - a new TRANSMISSION! $10,000. Seriously, at 40K miles this is a disgrace.  .  My pampered X5 has sadly failed me. Summary : Extended Warranty.