Truck systems are heated to prevent freezing. This was one of the problems when DEF was first introduce. It would be frozen when the truck was first started and cause problems. Now, the system allows time for the fluid to thaw before it starts working.
Free 2-day shipping on qualified orders over $35. Buy DEF Diesel Exhaust Fluid 5 Gallons (2.5 gal x 2 Jugs) at Walmart.com
DEF Fluid Diesel Exhaust Fluid 2.5 Gallon (2 Pack)
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Walmart # 574794566
Free delivery on $35+ orders
Arrives in 2 days, next day available