DEF Shelf Life!
Just a quick tip for those that are new to Diesels with all of the newer emission controls. DEF apparently has a shelf life and using anything other than DEF bought from the dealer may void your warr...
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The white crystals you found is the urea that is dissolved in water to make the DEF liquid. If it bothers you, just rinse the area with fresh water, especially after tank filling. Also, if you're concerned about the quality of DEF in the tank or being put into the tank, a DEF refractometer can be purchased on line for about $70. Do a Google search on "DEF refractometer price". They're very easy to use and extremely accurate.
