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Open Roads Forum  >  Tow Vehicles

 > DEF when towing

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FishOnOne

The Great State of Texas

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Posted: 03/06/22 05:36pm Link  |  Quote  |  Print  |  Notify Moderator

With recent fuel prices skyrocketing, not sure if DEF consumption is a really big deal.

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Cummins12V98

on the road

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Posted: 03/06/22 05:53pm Link  |  Quote  |  Print  |  Notify Moderator

FishOnOne wrote:

With recent fuel prices skyrocketing, not sure if DEF consumption is a really big deal.

[image]



At least they include lube.


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Huntindog

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Posted: 03/06/22 06:04pm Link  |  Quote  |  Print  |  Notify Moderator

I am now on my third Duramax.
My current one is a 2020. I do not use them for daily driving. They have all been 90%+ towing. I can say that this one uses a lot more DEF than the others.
GM obviously expected that, as this one has a larger tank.
It is what it is.

Having fun costs money. How much fun do you want to have?



Huntindog
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Grit dog

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Posted: 03/06/22 11:44pm Link  |  Quote  |  Print  |  Notify Moderator

We’re now almost 1/4 of the way through the 21st century.
Self driving vehicles actually exist, and the big 3 can’t figure out how to incorporate an accurate gauge for a consumable fluid, that is slightly more important than, say, windshield washer fluid!
Maybe glass sight gauges shouldn’t be a thing of the past! Lol

On a different note, I wish the def gauge in our truck was only part of the information screen and not an actual gauge. Because it looks like I have a broken gauge in the cluster since it’s been sitting below E since 2016….


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Toolguy5

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Posted: 03/07/22 05:49am Link  |  Quote  |  Print  |  Notify Moderator

Huntindog wrote:

I am now on my third Duramax.
My current one is a 2020. I do not use them for daily driving. They have all been 90%+ towing. I can say that this one uses a lot more DEF than the others.
GM obviously expected that, as this one has a larger tank.
It is what it is.

Having fun costs money. How much fun do you want to have?


That is what I am noticing but i will find out if i have an issue


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mkirsch

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Posted: 03/07/22 07:56am Link  |  Quote  |  Print  |  Notify Moderator

DEF freezes when it's extremely cold. So I would expect some unexpected results when the DEF is frozen which clear up after the DEF thaws out.


Putting 10-ply tires on half ton trucks since aught-four.

ksss

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Posted: 03/07/22 08:31am Link  |  Quote  |  Print  |  Notify Moderator

I would agree that the '20 uses more DEF than the older trucks use. Same L5P engine, but they clearly dialed up the DEF.


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Toolguy5

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Posted: 03/08/22 08:47am Link  |  Quote  |  Print  |  Notify Moderator

just picked up truck from Dealer. Could not find anything wrong with my DEF system. GM did issue an article revised February 3rd 2022 on Excessive Diesel Exhaust Fluid. The gauge is only a reference and may need several key cycles to show actual amount in tank. The rate of DEF will vary on Temperature, Altitude, speed and load. So the harder engine works the more DEF.
They Also stated as the NOx reduction requirements increase the more the newer vehicles will use. I guess 2020 was a reduction requirement year.
Article also states that if you receive message of XXX amount of miles that may not be accurate as well. It could decrease or increase depending on conditions and load of engine.

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