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Direct sunlight, temps in excess of 100 Deg are the most destructive to DEF to perhaps 6mo. Kind of ironic since under your hood could reach.. 130>. We see ambient temps often over 110 in the desert. Never had any trouble.
I've seen ignorant posts in forums stating you could add water in a pinch...to avoid being stranded..NOT!
Helpful information DEF / DPF facts:
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J&J 
DRV Suites ES-38RSSA #9679
GM Denali 3500HD-Max 4x, CC, 8' DRW
EZGo-TXT, Yamaha-G22E, CC Precedent
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