How often do you top up your DEF?

I fill my def at every fuel stop. I'm usually putting in 115-135 gallons of fuel and 3.5-3.9 gallons of DEF.

I e had 2-3 fuel stops in a row with crappy or non working def machines. Top off every stop and no worries

 

Pls explain how running out off DEF will destroy your engine.

 

it wont

 

About every other fill up.

 

I know it won't...........wanted @Diggler to explain how he come to his statement.

 

Cascadia has four little squares/indicator lights. When I get down to 3 I usually try to fill it/top it off next time I fuel.



Don't let it get low ever.
Especially in the winter those pumps have been known to freeze up.
Yesterday I filled up at J in Spiceland, they had signs saying out of DEF (at pump) due to low supply. First time I've seen that.

 

We all know that Pigs pee. They had to do something with all that pee. They can't just flush it into the streams as it kills fish. So they found out it burns really hot. Why not put it in a tank and make truckers burn it off as they drive down the road? one DOT employee said. The Sky is falling said another one. Women should vote said another.

 

Keep it 3/4 full or higher and issues with clogged systems will become almost nonexistent. The more air/less liquid you allow in the DEF tank, the more you're opening yourself up to problems later.

Especially in winter, keep near full and certainly top off when headed for sub- freezing temps/region.

 

Same thing, Cascadia has 4 green squares when it is full of DEF. Gets down to 3 squares, I put in just 5 gallons. 2-3 days later when it is back down to 3 squares I put in exactly 5 gallons again. In a rare case it got down to 2 squares, I put in 5 gallons it went up to 3 squares, next fillup I put in 5 gallons again it as showing 4 squares for a few hours then 3 and time put in 5 gallons again it was 4 squares for a couple days. I just keep it at 5 gallons, easier to figure my settlement checks next week and keep the company honest.