I know there is a Hybrid, but I haven't seen a diesel for the U.S. market.

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Traded -- 2006 BMW X5 3.0i
R.I.P. -- 2007 BMW X5 4.8i
Current -- 2011 X5 xDrive50i SAV: Platinum Grey Metallic, Black Nevada Leather, Dark Burl Wood Trim, SAV Pkg w/ Style 336 Rims, Cold Weather, Convenience, Premium Sound, Rear Climate, Technology, Roof Rails, Running Boards, Smartphone, Space Saver, and Rear Heated Seats.