DEF - Usage
Just on my maiden voyage with my 2014 Ram 3500 Diesel pulling 13,500lb 2009 Cardinal 34'. Pulls like a dream very nice to drive however after 1,000 miles I have gone through 1/2 tank of def, 2.5 gals...
Forum Discussion
The composition of DEF is fixed by the EPA. No special sauce or secret ingredients are allowed, they aren't even permitted to put any dye in it to pretend theirs is different from the next guy's. It is made of two of the cheapest substances known to humankind so there isn't even much incentive to cheat on making it. So there is no reason to buy any but the cheapest price DEF you can find. From whichever supplier you find it.
