af347763___Inc____SCR___Facts_about_SCR__THE_TRUTH
[COMPETITOR RELEASED MYTHS] MYTH: Frozen DEF will make your bus unusable. [THE TRUTH] 
FACT: Freezing won’t destroy or even damage DEF. Even if it does freeze, normal start-up and operation won’t be affected because the SCR system will thaw the fluid as the bus warms up. It’s been proven, since DEF has been used successfully in extremely hot and cold regions of Europe for several years.
Cardinal Bus Sales & Service, Inc. - SCR - Facts about SCR
THE TRUTH