Just bough a new 2014, I love the thing! I have about 500 miles so far and have a few questions. Does the Def fluid run into the exhaust all the time or only when a full recharge is called for? also is there an indicator so you know when it is recharging?

I also notice this place is a lot quieter then it used to be?

Thanks for the help! Bob

 

Seems like TDR has a free technical guide (.pdf?) that explains how all that works. I'm guessing only in active regen mode, no indication on the latest trucks on when that happens. I think 2010 was the last year that gave an indicator on the overhead display of regen, could be wrong though. Otherwise just keep an eye on the MPG display, it usually tanks during regen.

Not as much to complain about I guess .

 

Thanks for the reply, I found the tech article. I really love this truck!

 

Bob or SoHappy where is the tech article located? Cant seem to find it anywhere on this site.. Thanks

 

Started with the 2013 lets you know when the exhaust is 100% and in regen. The truck will use def all the time. In 14000 miles I have added 10 to 12.5 gal. When my def gauges goes to 1/2 tank I put a 2.5 gal bottle in it and it then shows full.
Fuel milage is between 18 and 21 mpg depending on the driving conditions. About 20 to 21 on hiway running 75 mph. Pulling a 36' 5th wheel it is about 9mpg at 75mph

 

Generally, DEF will flow a tiny bit almost all the time, but the rate can vary a lot.

DEF doesn't "recharge" anything. It combines with the catalyst to break down NOx. The system is designed to meter urea in proportion to engine NOx output.

Lower NOx output= less DEF flow.


What are the conditions that make for high NOx? Light load, lean mixtures, hot ambient temperatures.

Winter DEF consumption should be pretty low compared to summer rates. When towing heavy, you should see DEF consumption almost stop completely because the engine is making very little NOx.