DEF Math
The owner's manual says my truck has a 5.5 gal DEF tank. I waited until I was down to 1/4 on the gauge, just above the red zone, and added a 2.5 gal box of Blue DEF from Advance Auto. Now the gauge ...
Forum Discussion
Cummins12V98 wrote:
15 RAM with gauge at 1/2 a 2.5 fits easily.
X2!
