DEF shelf life
I have read that DEF has a definite shelf life, and I've heard figures of around 6 months. Given that most of us don't use our motorhomes in the winter, or at least like in my case, only on relatively...
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Cummins says around 3% DEF vs fuel. Burn 100 gal diesel, burn somewhere near 3 gallons DEF. I was using 8% in my Dodge Cummins pickup. Had it flashed again, with update, and it went down to where it should be. If you are over 4-5%, contact your engine maker, should not be that high.
