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
Having just bought my first diesel, I'm new to this DEF stuff and you got me wondering. Here's how to read the date code on Peak Blue DEF
Note that the year noted is the Expiration year, the year of manufacture is actually one year prior. So if your DEF is showing 2019, it was actually made in 2018 and is DEFinitely too old to use. :)
Note that the year noted is the Expiration year, the year of manufacture is actually one year prior. So if your DEF is showing 2019, it was actually made in 2018 and is DEFinitely too old to use. :)
