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
Lantley wrote:BurbMan wrote:
They have it at Costco? Thanks for the heads up on that!
Lantley how do you know if you're out of DEF without a gauge?
You guess! Actually there is an idiot light that comes on and says" Low on DEF 100 miles to go until forced limp mode"
Except the mileage given is not accurate. It may come on 2 minutes later and say 50 miles to limp mode.
I learned to carry a box of DEF in the RV because I never know when I may run out!
I had to get off 95 in the very congested Fredricksville, VA area once to chase down a jug of DEF for fear I would go into limp mode. I'm still pissed about it.
A 2019 with no gauge is ridiculous. For that matter any year with no DEF gauge is a crime!
There is a DEF gauge on your 19 if you are not aware. It is on your DIC, just scroll through and check it and it will show up. It is like a RV gauge in the sense that it shows percentages below 30%. The 20's have a legit gauge that reads like a fuel gauge, much better than previous for sure.
