Lance A Lott Posted April 10, 2018 Report Share Posted April 10, 2018 The def that's in my tank is from when I drove it home last April. I have no way to know how old what was in the tank was when I Picked up the truck. When I started it up a week or so ago to take it out of the garage it was showing nox codes. I was wondering if it was advisable to start with fresh def. Link to comment Share on other sites More sharing options...
NDBirdman Posted April 10, 2018 Report Share Posted April 10, 2018 When in doubt, just do it. Is there a drain on the bottom of the tank? Death Juice is cheap. The stuff in my tank is about 8 months old but I'm not getting any codes. But, I only drive mine bout once a month. Maybe someone more knowledgeable will chime in. 2022 Coachman Leprechaun, traveling around to dark sky areas and chasing the stars. Link to comment Share on other sites More sharing options...
DesertMiner Posted April 10, 2018 Report Share Posted April 10, 2018 What about changing the filter at the pump? Also check the condition of the tank and the supply lines. Link to comment Share on other sites More sharing options...
NoDirectionHome Posted April 10, 2018 Report Share Posted April 10, 2018 DEF doesn't go bad. It does degrade in strength, but your system will just adjust and use more till it's effective. "There are No Experts, Do the Math!" 2014 Freightliner Cascadia DD16 600hp 1850ft-lb 18spd 3.31 260"wb SpaceCraft S-470 SKP #131740 Link to comment Share on other sites More sharing options...
Scrap Posted April 10, 2018 Report Share Posted April 10, 2018 A DEF refractometer will tell you which way to go if it is suspect. Dip a sample and if above 34% and below 30% it'll need to go. Link to comment Share on other sites More sharing options...
GeorgiaHybrid Posted April 10, 2018 Report Share Posted April 10, 2018 If you are at the ECR, give me a shout. I have a DEF refractometer that you can use to check it. 2023 Thor Magnitude XG32 Link to comment Share on other sites More sharing options...
Lance A Lott Posted April 10, 2018 Author Report Share Posted April 10, 2018 Thank you for the quick replys. If I work real hard I hope to use the truck for our August vacation. I looked up the price of a def tester, I think I will change it out that will be less expensive. This is the first diesel I have had with def so not much experience with it. Link to comment Share on other sites More sharing options...
jkoenig24 Posted April 11, 2018 Report Share Posted April 11, 2018 DEF has a shelf life of at least two years. It's OK if it freezes and then thaws. If you've been adding fresh DEF to whatever was in the DEF tank, you're probably fine. Link to comment Share on other sites More sharing options...
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