Trucks that sit with emissions intact

[RO285]

Forgive me if this topic has been covered. I looked but did not find anything specifically about this.

I've recently purchased a 2013 Freightliner M2 112 tractor with an ISL9 with very low miles, less than 24k, as an upgrade to an old 1987 truck. It's going to spend a lot of time just sitting, 3k miles a year maybe, and I am interested in how bad that is for the emissions system, specifically the def system. I have a pseudo mechanic telling me this thing will cost me as much as I paid for it in repairs if it isn't run hard and often. What kind of damage does sitting do to the emissions system and how might I mitigate it? If the truck is going to need repair for just sitting in a barn it might be for sale soon.

My thoughts were to keep the def pretty low in the tank to help keep it fresh. Other than that I'm not sure what can be done or if it is even a real issue. Appreciate your thoughts

[hookliftpete]

He is more or less correct. Run it at min monthly to avoid lot rot, if you are up to it get it demandated.