Def usage?

[redwngr]

On 5/27/2020 at 7:40 PM, MTU Alum said:

The emissions requirements have tightened since 2017 so will have to use more def to be compliant.

 

#iworkforGM 

What % of fuel should be expected now?

 

Back in 2010/11 when DEF was new there was a GM document that indicated about 1.5% of fuel, iirc.

(so 1.5 gal def per 100 gal fuel)

 

Is there an updated document / number available?

 

[Njmurvin]

My truck has about 1400 miles on it - probably half of that towing my 12K lb fifth wheel. On one of my visits to the service department for an oil leak, they re-flashed my computer which was supposed to make the DEF gauge more accurate. I am currently showing about 1/2 tank on the DEF gauge.

[07HD]

Just had my 2020  in for my free oil change at 1100 miles, They said there was a recall I guess he meant service bulletin. They installed a new program for the Def system and filled the tank up. My gage wasn't going down  very quick, it even went back one bar before I took it in and I've never added any fluid. Guess will  see how it works now.

[shadow gray 2020 hd]

After about 1000 miles, the def gauge on my truck finally came down off full.  Another 500 miles it has dropped another bar.  Will let it get down to 3 bars and see how much it takes to fill it back up.  But appears the gauge is working.