No problems here in NJ, and traveling on NJ fuel to colder places in Vermont and such (even though I was told horror stories of people filling up in CT and getting jellied-up in Vermont). DEF held up nicely - lasted between oil changes, even though I did have a fare amount of idling.

A small trick to consider - the "active" def tank is heated, so if you know you will be heading into very cold weather, or traveling north, simply top the active tank off before that, and you will be good for ~2000 miles worth of driving in cold temps.

__________________
His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive