TO ALL EXPERIENCING ISSUES WITH DEF:
i urge you to state your problems and concerns to BMW NA customer service.
after a lengthy discussion with a very willing and helpful Amelia over there today, i learned that BMW does not have any parameters for what is normal regarding this fluid and its consumption, especially regarding cold temps and short trip driving. the fact is, as of right now, the DEF is our problem until enough instances arise to cause BMW to examine the issue.
i ended up having my def fill-up good willed, but probably not next time.
if your fluid does not make it the full 10k between scheduled services (or 1 year) REPORT THIS PROBLEM. we all went gaga for this new diesel technology, and if you're like me you're paying through-the-roof interest rates (because they dont know how it will be on the resale end). why should we be punished because of where we live or how we drive?
I especially urge those in cold climates experiencing issues to call in.
BMW needs to step up and deal with this.

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01 X5 3.0i (gone)
04 X5 4.8is (gone)
06 X5 4.4i (gone)
09 X5 35d (current)
12 X5 35d (current)