2021 3500 DEF Capacity

[Dmcintyr]

I can’t find the capacity for DEF for a 2021 3500 heavy duty Laramie 4x4.

 

[KoboldTaco]

If it’s the same as a 22’ with the CTD, 5.5 gallons (ish). When you add DEF, pay attention to the gage start and ending position and compare it to how much you put in. You can deduce it from there.