...and you can find just as many articles that state you don't need to use additives, Articles I've seen are dealing more with diesel engines since DEF was added (2010)...I've not used any additives in the 10, 12 or 13 Ram's I've owned or the 07.5 Chevy D/A 3500 dually I owned and never had an issue. In temps below zero and near 100, towing or empty.
again, for every article that say's use an additive, you'll find one that say's you don't need to.
GM recommends an additive "IF" you feel you need one.
Ram doesn't recommend them that I'm aware of...