BMW NA still has no answer to my 335d running out of DEF at 4,000 miles. My local dealer does not stock it. I am on a road trip to DC this week and have only 715 miles left before no start. I went to T/A Truckstop and bought a 2.5 gallon jug of approved DEF and low and behold, you can't pour it into the tank without the BMW designed filler. Crap! So I call roadside assistance and...they don't carry it on the truck. Crap again. So I use the SOS feature and the man on the other end suggested that I call the BMW dealer in DC and schedule an appointment and that they will make sure that the dealer has DEF in stock. This is starting to get annoying and I'm also about to bust a nut! Lets see what they say tomorrow.