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Question for you guys, I take care of the rolling apparatus (14) units at our local volunteer fire / rescue dept. We have a 2019 Dodge Ambulance (diesel) and have ran it hard since purchase. Purpose for this was get it thru initial warranty period, making sure we had no problems with the unit in general. Now we are looking at moth balling it and running out our 2008 Dodge as "first out unit". To date we have had "0" problems with the 2019, it has 30k miles. I think we should put the 2019 in a rotation, example....run it first out, 1 week per month....?? Other suggestions....?? Does anybody have advice on, known problems from setting? Will we create problems from DEF crystalizing, dosing valves sticking an etc....? Around here the tractors and so forth are used on a regular bases so I don't have too much case history of what happens when you park something with DEF for an extended time. The powers that be want to leave it out of a rotation an only run it on "second out calls" which doesn't happen that often. What problems will we create if any? Any and all advise greatly appreciated.....