To search for diesel stations in the nav, POI database (It's usually out of date, but good reference just in case.)
Category: Fuel Stations
(2nd Category line) Category (Several Category Details) : Fuel Types -> [Select Diesel]
If you highlight start search, you can store that and at least for me, it stored the whole search including the diesel selection as a memory item so I can press that to search for diesel stations nearby.
2011 335d Le Mans Blue Black Leather/Aluminum Premium M-sport w/ Paddles Heated front seats, Navigation, Comfort Access Split Fold Down Rear Seats Harmon Kardon, Ipod/USB, Sattellite Radio, Alarm
Picked up at welt on March 2011 : pictures of car during ED
Redelivered May 2011 : Pictures of Car after Redelivery