Join Date: Jan 2007
Location: Upstate, SC
Thanked 95 Times in 84 Posts
I won't jump in the additive discussion because it will turn into a pissing contest.
DEF is best purchase at a pump in a truck stop that has lots of traffic going through it. This is because DEF has a shelf life. The high volume truck stops are always getting fresh product because they are always going through the product. It is also less expensive there.
2014 2500 Laramie 4x4 CC Long bed black on black, 3.42 gears, 68rfe. Window visors tri-fold bed cover, EFI live CSP4 from HPP Tuning.