I'd say the 4.8 for 3K, the 3.0 is nice but it could use more punch for sure! The N54 would be great to have in this truck, but I think the 3.5d is the one to have. 452 lb/ft of torque... sick!!!! That's more than the V-8 M3 and will get better fuel economy. I am looking to get a 335d when they come out then when our X5 3.0L lease is up get the wife an X5 3.5d then brew my own home brew bio-diesel and tell OPEC to F-off!

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2008 X5 3.0si
Monaco Blue | Saddle Brown Nevada Leather | Premium Package | Rear Climate | Technology Package |Auto-Tailgate |Comfort Access | Running Boards | 3rd Row seats | Power and Heated Fronts | Ipod Adpt | SAT Radio|