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I could be totally wrong, but I now feel even more strongly than before that the delay with the diesel in the US is due to issues getting it to meet the CARB and EPA emissions standards.
If you search the EPA's data base, you find that BMW asked for approval on the emissions of the gasoline powered 2014 X5 35i back in February of 2013 and received approval from the EPA on 3/7/13.
However, the EPA's web site is not yet showing any indication that BMW has even submitted the 2014 X5's diesel for federal approval (even if the revisions are modest, they still need to be CARB and EPA approved). Moreover, the EPA's approval for the 2013 version of the X5 diesel (which was applied for on 8/27/12 and approved on 11/8/12 ) expires on 12/31/13.
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