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DEF how old is too old?

VinnyP
Explorer
Explorer
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?
Vinny & Rita
The Bronx, NY
2013 F350 Lariat 6.7L PSD CC
2012 Cedar Creek 36B4
2009 Holiday Rambler Savoy LX
2015 Rockwood 2109S Mini-Lite
16 REPLIES 16

Huntindog
Explorer
Explorer
VinnyP wrote:
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?

IMO the risk reward ratio is not good
$10 worth of def vs a huge repair bill if it goes bad in the tank
Huntindog
100% boondocking
2021 Grand Design Momentum 398M
2 bathrooms, no waiting
104 gal grey, 104 black,158 fresh
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1860watts solar,800 AH Battleborn batterys
2020 Silverado HighCountry CC DA 4X4 DRW

Turtle_n_Peeps
Explorer
Explorer
There is no solid answer.

All sorts of conditions come into play like heat or cold or sealed or unsealed.

"I" would not worry about it if it was sealed. But that's me.
~ Too many freaks & not enough circuses ~


"Life is not tried ~ it is merely survived ~ if you're standing
outside the fire"

"The best way to get a bad law repealed is to enforce it strictly."- Abraham Lincoln