af347763___Inc____SCR___Facts_about_SCR__THE_TRUTH
[COMPETITOR RELEASED MYTHS] MYTH: DEF degradation will be a big problem. [THE TRUTH] 
FACT: It hasn’t been a problem in Europe, where climates are just as extreme as those in North America. DEF has a shelf life of approximately one year, but even with the typical period of school bus inactivity in the summer, DEF degradation just will not be an issue.
Cardinal Bus Sales & Service, Inc. - SCR - Facts about SCR
THE TRUTH