2023 DEF usage
Mountain Pass
Joined: May 2007
Posts: 203
Likes: 61
From: Baja or Canada
I am sure about more DEF usage means less EGR, the 2 are not related. The EGR is mounted on the exhaust manifold basically to recirculate the exhaust back in the intake to re-cycle the unused fuel and combust through the engine again
And, DEF is injected after the DPF to convert nitrogen oxides (NOx) in to nitrogen, water, and small amounts of carbon dioxide.
The main reason 2023+ use more DEF is to meet the newer and tougher emission standard and there is no way for the MFGs to get around it.
In the direction things are going, they may build a DEF tank 2X of the fuel tank
That reminds me, in the beginning I remember paying $5.95 for a 2.5gal jug of DEF....
And, DEF is injected after the DPF to convert nitrogen oxides (NOx) in to nitrogen, water, and small amounts of carbon dioxide.
The main reason 2023+ use more DEF is to meet the newer and tougher emission standard and there is no way for the MFGs to get around it.
In the direction things are going, they may build a DEF tank 2X of the fuel tank
That reminds me, in the beginning I remember paying $5.95 for a 2.5gal jug of DEF....
If they raise cylinder temperatures it reduces particulate matter and unburnt fuel. This also increase Nox output...and def consumption. It's a bit of a balancing act and of course changing emission standards weigh in as well.
1st Gear
Joined: Mar 2024
Posts: 1
Likes: 0
2023 6.7 DEF Usage
My 2020 F250 6.7, when not pulling anything, I would easily go oil change to oil change, 10,000km (6,000 miles) without having to even look at the DEF gauge. The gauge would normally indicate 15,000km range when full. Tag the fifth wheel on the *** and that's different, I get that.
My new 2023 F350 6.7 is pig on DEF usage. Meanwhile the Exhaust Filter has never gotten above 45% and reads zero most of the time. The Exhaust Filter will show 15% and then go to zero, not 10 and then 5, straight to zero.
When the DEF system is running, you can smell it, it gets hot and it seems to operate non stop.
I did a 1,500km trip this week, all highway running about 110-120kmph, left with 86% DEF and finished with 60% level, Exhaust Filter reads at zero! Crazy.
I log when I add DEF and will compare shortly when I refill the tank.
My new 2023 F350 6.7 is pig on DEF usage. Meanwhile the Exhaust Filter has never gotten above 45% and reads zero most of the time. The Exhaust Filter will show 15% and then go to zero, not 10 and then 5, straight to zero.
When the DEF system is running, you can smell it, it gets hot and it seems to operate non stop.
I did a 1,500km trip this week, all highway running about 110-120kmph, left with 86% DEF and finished with 60% level, Exhaust Filter reads at zero! Crazy.
I log when I add DEF and will compare shortly when I refill the tank.
Cross-Country
Joined: Dec 2013
Posts: 50
Likes: 8
From: Austin
DEF warning msg, and light
My 2023 was displaying a warning light and MSG, you have 499 miles till empty on DEF, fill soon. WTF. how stupid. I have a half of tank left. I did tow a 5er to the gulf coast, then the light/warning started showing. I followed what one poster said about adding more DEF. I did and it worked. The warning and light went away. But for how long, not sure.
Lead Driver
Joined: Nov 2005
Posts: 5,217
Likes: 4,221
From: Kaysville Utah
My 2020 F250 6.7, when not pulling anything, I would easily go oil change to oil change, 10,000km (6,000 miles) without having to even look at the DEF gauge. The gauge would normally indicate 15,000km range when full. Tag the fifth wheel on the *** and that's different, I get that.
My new 2023 F350 6.7 is pig on DEF usage. Meanwhile the Exhaust Filter has never gotten above 45% and reads zero most of the time. The Exhaust Filter will show 15% and then go to zero, not 10 and then 5, straight to zero.
When the DEF system is running, you can smell it, it gets hot and it seems to operate non stop.
I did a 1,500km trip this week, all highway running about 110-120kmph, left with 86% DEF and finished with 60% level, Exhaust Filter reads at zero! Crazy.
I log when I add DEF and will compare shortly when I refill the tank.
My new 2023 F350 6.7 is pig on DEF usage. Meanwhile the Exhaust Filter has never gotten above 45% and reads zero most of the time. The Exhaust Filter will show 15% and then go to zero, not 10 and then 5, straight to zero.
When the DEF system is running, you can smell it, it gets hot and it seems to operate non stop.
I did a 1,500km trip this week, all highway running about 110-120kmph, left with 86% DEF and finished with 60% level, Exhaust Filter reads at zero! Crazy.
I log when I add DEF and will compare shortly when I refill the tank.
I can frequently watch the passive regens on my truck clean the filter to Zero and then still watch it kick into an Active Regen when I hit the 500 mile magic number. You are not smelling DEF. You can smell your exhaust get hot when your truck does a Regen. That will push your filter temps up over 1100°. The 23's and newer trucks use more DEF than previous trucks because of increased EPA requirements. The problem I've seen with mine, Is it calculates the distance remaining on the worst consumption it has recently seen. Hence if I climb a 14% grade pulling my trailer, It's going to pop up and say 500 miles to empty even though I have over a half tank and probably a 1000 miles left. I do see my HO consuming around 1 gallon of DEF per 350 miles towing my 13,000lbs trailer and around 900 miles per gallon when I'm empty using the truck as a daily driver.
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