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Extended DEF Programming update?

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Old

Oct 5, 2025 | 02:22 PM

#1

The Peddler

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More Turbo

Joined: Sep 2009

Posts: 537

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Extended DEF Programming update?

Does anyone know what we need to do to get the newly allowed extended empty DEF range before limp/de-rate kicks-in? Is this a dealer visit, free or paid?

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Old

Oct 5, 2025 | 07:10 PM

#2

FishOnOne

Lead Driver

Joined: Feb 2005

Posts: 7,912

Likes: 2,637

From: The Great State of Texas

Since Jim Farley laid off many of the ICE engineers to focus on EV's, I wouldn't expect this change anytime soon.

Edit: Maybe I was wrong. LOL

Last edited by FishOnOne; Oct 5, 2025 at 08:11 PM.

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Old

Oct 5, 2025 | 10:08 PM

#3

Flatland1

Mountain Pass

Joined: Jan 2022

Posts: 179

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Why worry about it............I fill my DEF tank when I get the notice from the truck..........If I'm not towing I get at least 9K miles on a refill of 5 gallons of DEF.............

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Old

Oct 6, 2025 | 02:37 AM

#4

augam

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Joined: Jun 2023

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Quote:

Originally Posted by Flatland1

Why worry about it............I fill my DEF tank when I get the notice from the truck..........If I'm not towing I get at least 9K miles on a refill of 5 gallons of DEF.............

I’m in as soon as it is available. Like he said in the video if your sensor flakes out you could go into de rate. Also no guarantees it wouldn’t be rescinded later on down the line.

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Old

Oct 6, 2025 | 07:51 AM

#5

speakerfritz

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Joined: Jul 2013

Posts: 14,235

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Quote:

Originally Posted by Flatland1

Why worry about it............I fill my DEF tank when I get the notice from the truck..........If I'm not towing I get at least 9K miles on a refill of 5 gallons of DEF.............

I use about 2.5 gallons a year ….i time it so I know I’m no higher than half full going into winter to allow for freeze expansion …hopefully preventing cracks. So ideally add the 2.5 gallons every spring.

but…I’m running methonal injection (blue washer fluid) which reduces NOX anyway so NOX reduction via DEF injection becomes a lower need.

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