What's up youtube Family, in this video I show how to Test your DEF before you put it in the tank, I've heard many horror stories of guys filling up their tank and Def quality codes pop up, because of this I've been useing box stuff, but I'm considering useing pump def to cut cost. if you do get Bad DEF and take it to the dealer, all the will do is drain it and charge you some big money, you can easily drain it out yourself. if you want to know how, watch my def quality level sensor video. Hope you guys enjoy.