Re: Winter operation
I have had mine at -26C for several hours and -17 to -20 for days at a time even over night for a week outside at -17 with no DEF issues. I agree with NorthMan that the DEF tank should be only about 1/2 full or less since a full tank is a lot of mass to try to keep from freezing (8 gallons). DEF is 68% water and the DEF fluid will freeze at -11C. In the Winter less is better...in the Summer less is better too since the stuff is also heat sensitive.
It makes you wonder who the genius was that invented the DEF-catalytic system for vehicles that have to work in temperature extremes where the key fluid for the whole low emissions system is sensitive to Summer heat and Winter cold in most of the Norther Hemisphere.
Dom's DEF Guard, Anodized Fuel and DEF tank caps, Husky interior mats, Mopar Cargo Mat, Door Sill protectors, Tires Cooper Discoverer ATP, Blue Ox Base plate, SMI Air Force One supplementary braking system, Kenwood TM-710G Ham Radio, LED rear fog lights, etc