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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 11-22-2011, 09:12 PM   #11 (permalink)
gmctruck2013
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up hear in maine it will freeze up.and truck will not run.h&s is making programer.all of guys are thinking of taking low hanging freezing water take off

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Old 11-22-2011, 09:39 PM   #12 (permalink)
redwngr
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Originally Posted by gmctruck2013 View Post
up hear in maine it will freeze up.and truck will not run.h&s is making programer.all of guys are thinking of taking low hanging freezing water take off
heard from a guy in Canada that GM knows it freezes and that's why the tank has a heater to thaw it so it can be injected...

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Old 11-22-2011, 11:22 PM   #13 (permalink)
Cumstrokemax
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Originally Posted by gmctruck2013 View Post
up hear in maine it will freeze up.and truck will not run.h&s is making programer.all of guys are thinking of taking low hanging freezing water take off
Up here in the great white north,the DEF sure as heck does freeze, like 'redwngr' said , fluid is heated before injection, at -20 the truck runs flawlessly. New technology is so misunderstood, and ideas that your DEF will freeze and truck won't run are obviously misinformed rumors, at least according to all the DEF useing diesel trucks up here, 18 wheelers,Ford and GM diesel pick- ups, Ram C&C , all running this "mystery fluid" , probably gets a little colder here than down in Maine.
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Old 07-26-2013, 05:44 PM   #14 (permalink)
mattgrant11
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Originally Posted by newdude View Post
Your truck has a DEF tank on board. Diesel Exhaust Fluid. It is 32% water, 67% urea, and is injected into the exhaust to aide in reducing tailpipe emissions. The tank holds around 5.3 gallons of it, and its fill time is typically dependant on mileage.

As to additive, I don't own a diesel, but these new trucks are designed to run right off the stuff out of the pump. At the Chevy dealer I work at, we have a bottle or two of a Castle branded additive but they just sit on the shelves. And in my opinion, be very careful what you think about doing to your truck (removing the DEF/DPF, additives, etc) in relations to the GM powertrain warranty, while it is still in effect. When it runs up, imo, go for it.
It is actually 67.5% water and 32.5% urea, I have it in my cummins 5500 work truck and it is a pain in the *** always has sensor issues, around 50k it was in the shop at least once a month for prob 6 months or so, luckily not many problems in the last 20k
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Old 07-26-2013, 07:43 PM   #15 (permalink)
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Mine tank is sitting on my shop on the floor. I use a H&S tuner for the delete. I ran a 4 inch straight pipe, and gained a true 2 - 3 miles to the gallon and never have to worry about adding DEF fluid. I have 10,000 miles with 0 issues. My only regret is not doing it from day 1.
It has been beaten over and over again on here that the DPF and DOC "use" 2-3 mpg to function. It's just a fact.

I DOUBT the DEF system hinders mileage at all, but it's not going to be used if the other two components are not in use - so it's a moot point.

My point is - the mileage improvement will still apply to DEF trucks when the exhaust is changed out.

As far as licensing / selling the truck with this modification - it's only about 45 minutes to swap out the stock for the performance exhaust. And vice-versa. So, every two years, I swap it back - register the truck - and swap it again. The mileage improvement more than pays for the cost of the mods AND the inconvenience.
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Old 09-18-2017, 07:28 AM   #16 (permalink)
153500HD
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DEF

Well mine is having mayor issues. Such as it reads I'm low so I fill and it only takes 1/4 of the bottle and it spills out. It read that it going to slow down in 60 miles till slow speed to 55mph and I have taking it for repairs 4 times to different dealerships. Now that I'm over the 36000/3 year warranty they are telling that to fix it will cost $2,600. So you tell me
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Old 09-18-2017, 10:38 AM   #17 (permalink)
ktmrfs
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Originally Posted by 153500HD View Post
Well mine is having mayor issues. Such as it reads I'm low so I fill and it only takes 1/4 of the bottle and it spills out. It read that it going to slow down in 60 miles till slow speed to 55mph and I have taking it for repairs 4 times to different dealerships. Now that I'm over the 36000/3 year warranty they are telling that to fix it will cost $2,600. So you tell me
emissions systems by law must be warranted for much longer. 10 yrs, 100K miles IIRC.
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