samhain7ExplorerNov 19, 2020Ram 2500 DEF fluidHi all I am on tank of gas # 6 on my new to me truck and thrnDEF fluid gage has barely even moved How long do you get on a tank of DEF fluid and how big is the reservoir? ThanksShow More
wanderingbobExplorer IINov 19, 2020On my 2500 CTD , when gauge sez 1/2 I pour in 2 1/2 gallons . But you are correct , it will say full and then " bang " , it is on half !