DEF how old is too old?
I have an opened jug of DEF dated July 2019. Can't tell if that is a manufactured date or an expiration date. Any ideas? Or should I just breakdown, dump it and buy a fresh jug?
Forum Discussion
From what I've read, DEF gets "iffy" after 18-24 months. Is that date of July 2019 from a Blue DEF code? If so, it was actually made in July of 2018.
