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 > DEF Math

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JKJavelin

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Posted: 11/26/20 06:58am Link  |  Quote  |  Print  |  Notify Moderator

BB_TX wrote:

Understanding DEF date code. Not obvious.

DEF date cide


This is why I tend to not buy Peak. WAY too cryptic date code. Why not just use a date?
JK


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noteven

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Posted: 11/26/20 07:20am Link  |  Quote  |  Print  |  Notify Moderator

What we learned in the class 8 world is high EGT's (power demand) result in increased NOx emission which = increased DEF use. In a working class 8 truck that was around 1-2% DEF vs fuel.

If I owned a DEF using pickup I would measure in some DEF fills at the pumps vs fuel used and soon have a rate vs fuel use vs work we are doing today factor to know when to fill the DEF tank.

If I messed up and needed some emergency like, I know all heavy truck and equipment dealers who sell current emissions engines are required by law to stock DEF - truck dealers, ag dealers, and likely yellow construction equipment now too. They are often located along main highways.

That would be the day I would exit a trip and drive around looking for a shopping plaza or China parts store to buy DEF in a cardboard box down aisle 300.

rhagfo

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Posted: 11/26/20 07:52am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

15 RAM with gauge at 1/2 a 2.5 fits easily.


X2!


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Posted: 11/26/20 08:13am Link  |  Quote  |  Print  |  Notify Moderator

noteven wrote:

What we learned in the class 8 world is high EGT's (power demand) result in increased NOx emission which = increased DEF use. In a working class 8 truck that was around 1-2% DEF vs fuel.

If I owned a DEF using pickup I would measure in some DEF fills at the pumps vs fuel used and soon have a rate vs fuel use vs work we are doing today factor to know when to fill the DEF tank.
a shopping plaza or China parts store to buy DEF in a cardboard box down aisle 300.

In my case my DEF use is erratic because my truck is my daily driver. I'm not towing all the time.
Tying to calculate/predict my DEF use based on my driving habits is futile.
Just need a gauge!


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FishOnOne

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Posted: 11/26/20 11:01am Link  |  Quote  |  Print  |  Notify Moderator

Lantley wrote:

noteven wrote:

What we learned in the class 8 world is high EGT's (power demand) result in increased NOx emission which = increased DEF use. In a working class 8 truck that was around 1-2% DEF vs fuel.

If I owned a DEF using pickup I would measure in some DEF fills at the pumps vs fuel used and soon have a rate vs fuel use vs work we are doing today factor to know when to fill the DEF tank.
a shopping plaza or China parts store to buy DEF in a cardboard box down aisle 300.

In my case my DEF use is erratic because my truck is my daily driver. I'm not towing all the time.
Tying to calculate/predict my DEF use based on my driving habits is futile.
Just need a gauge!


I'm surprised you don't have some form of gauge. I use my truck as a daily driver and notice it uses less DEF during the cold months.

Bottom line after 8 years and 200k miles I never ran out and never had any DEF related issues using only Peak Blue DEF. I use a Ford brand DEF nozzles that prevents over fills that I clean and store it in the zip lock bag it came in. I typically add 2.5 gallons every ~6,000 miles


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Posted: 11/26/20 11:18am Link  |  Quote  |  Print  |  Notify Moderator

ShinerBock wrote:

Buy from the pump at truck stops. Not only is it fresh and stored in a cool place to last longer, but is also only costs about $2 per gallon.

My dealerships sells DEF. I can tell you that most of it sits out in a hot warehouse or in a hot semi-trailer for ages before being put out in the showroom which lowers the shelf life.


Between the cost savings, and being assured you have fresh, not expired DEF, I don't know why anyone would buy it in a box. Sure, it can be slightly inconvenient pulling up to the truck stop and running inside, but as sensitive as some report the fuel systems are it is worth the trouble.

Filled my Jeep up this week. It gets about 1500 miles/gallon of DEF, granted it is more DD, but is used to tow boats. That 8 gallon tank is nice. Not sure why the trucks don't use a bigger tank.


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Me Again

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Posted: 11/26/20 01:55pm Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

Cummins12V98 wrote:

15 RAM with gauge at 1/2 a 2.5 fits easily.


X2!


One has to use 1 to 1.5 gallons when the tank is full before the gauge even starts to move down. It is very slow at the top and more speedy on once the gauge starts moving.


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rhagfo

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Posted: 11/26/20 02:35pm Link  |  Quote  |  Print  |  Notify Moderator

Me Again wrote:

rhagfo wrote:

Cummins12V98 wrote:

15 RAM with gauge at 1/2 a 2.5 fits easily.


X2!


One has to use 1 to 1.5 gallons when the tank is full before the gauge even starts to move down. It is very slow at the top and more speedy on once the gauge starts moving.


While that may be true, at least Ram thought in give you a gauge. Ford and GM didn’t have them early on, and I am not sure if either has a gauge yet.

FishOnOne

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Posted: 11/26/20 02:54pm Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

Me Again wrote:

rhagfo wrote:

Cummins12V98 wrote:

15 RAM with gauge at 1/2 a 2.5 fits easily.


X2!


One has to use 1 to 1.5 gallons when the tank is full before the gauge even starts to move down. It is very slow at the top and more speedy on once the gauge starts moving.


While that may be true, at least Ram thought in give you a gauge. Ford and GM didn’t have them early on, and I am not sure if either has a gauge yet.


The 11-16 Super Duty's tells you "The exhaust system is OK", "under half full", and two different miles left warnings (don't remember the exact miles left messages). The '17-Up have a digital DEF gauge.

The Ram def usage rate is not linear and will go down at a faster rate once the fluid gets down to a certain level. Not sure if Ford or GM does the same.

FishOnOne

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Posted: 11/26/20 03:14pm Link  |  Quote  |  Print  |  Notify Moderator

Here's a video on DEF common problems. Crystallization and contamination being a couple of the big problems.

Link

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