Where do you buy your DEF? Preferred brand?

Def is about 70% water. If you keep topping off at say 80% def load. Then over time enough water will evaporate off in the near consistant def load to start to cause issues especially in hot dry enviroments. It takes a long time, say weeks or even months maybe more if your tank is better sealed then mine for example but i saw it begin to happen when i tested my own def, when i didnt let it burn enough off for too long. So its just cheap insurance to burn off enough to keep the ballence more in line.

 

I just get my DEF from the guy in the next parking spot who parks after me and runs his reefer all night. I figure we're even.

 

I have never found DEF with a high concentration. It’s always diluted or low….always.

 

Ive found it a couple times. One had only .07% water. Had to retest it 3 times to belive it. But i also fuel at ma and pas a lot

 

One of those things I guess I would have to see to believe.

 

The acceptance threshold is about plus or minus 2% from the correct level of 32.5%. Outside of that range and your gonna have issues.

For the mathematically challenged that’s around 30.5 -35% range.