I have found some EXXON stations here have YELLOW handles for their diesel and require use of the adapter to refuel.

I always go inside and ask when their diesel was delivered and the number of gallons delivered just to be sure its fresh.

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Current - 2010 X5 35d
Retired - 2008 X5 3.0
Retired - 2007 X5 3.0
Retired - 2006 325 3.0