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Old 05-21-2013, 05:29 AM   #57
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I have been told that the urea fluid additive breaks down in high temperatures which can reduce the effectiveness up to 50%. So whether you can get the normal range on a hot day is problematic, As when the urea tank goes empty due to higher usage for the same effect, one will find the engine goes into limp mode.

That is why I searched for and found a 2012 Dodge since it would be without that urea requirement.
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TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell

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Old 05-21-2013, 09:37 AM   #58
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I have been told that the urea fluid additive breaks down in high temperatures which can reduce the effectiveness up to 50%. So whether you can get the normal range on a hot day is problematic, As when the urea tank goes empty due to higher usage for the same effect, one will find the engine goes into limp mode.

That is why I searched for and found a 2012 Dodge since it would be without that urea requirement.
It's a non-issue for us in trucking. And the heat/humidity index here is comparable to any spot in the US outside of Death Valley. We fill from a 275-gl tote at the main yard and I top off weekly. I think the tank holds around 15-gls. Otherwise a range of several thousand miles or 2-3 weeks. So some of that is "old" in the tank and exposed to air temps in excess of 120F out on drilling rig sites for hours or days (the night time low is 80F). I don't see a consumption change on year-round basis.

One can buy DEF in small square cartons that could be kept in the bed (for those concerned).

There are no disadvantages, only incorrect perceptions (given that DEF is here to stay, and stringent emissions requirements are now the norm). These trucks are better drivers (485HP/1650TQ Cummins ISX) than the SCR controlled ones they replace.

Otherwise, stick to 2007 and earlier trucks.

.
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Old 05-21-2013, 10:54 PM   #59
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Originally Posted by switz View Post
I have been told that the urea fluid additive breaks down in high temperatures which can reduce the effectiveness up to 50%. So whether you can get the normal range on a hot day is problematic, As when the urea tank goes empty due to higher usage for the same effect, one will find the engine goes into limp mode.

That is why I searched for and found a 2012 Dodge since it would be without that urea requirement.
DEF does not last as long over time in storage as the heat goes up but that time will not affect any one that drives on a semi-regular basis.The Rams do not go into limp when the def tank is empty.What happen is you get a warning in the dash the level is low(about 200 mi).When the tank is empty the engine will not restart but if left running it is fine.
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