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
FishOnOne wrote:
The Ram def usage rate is not linear and will go down at a faster rate once the fluid gets down to a certain level. Not sure if Ford or GM does the same.
Usage is linear, however the gauge is not! Those are separate issues. Like Russ said, it is nice that RAM gave "us" a gauge. I like having it, as it makes it easy to know when to look for a WM and put in a box of Peak Blue DEF. All has been Peak Blue DEF except of the last one which for WM Supertech Jug, and I am going to run it lower before adding another box. All has been from WM except one in Wells, Nv from Love's.
