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Old 08-02-2016, 09:30 AM   #11
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This is from DEF Overview - discover Diesel Exhaust Fluid (DEF):

"Diesel Exhaust Fluid (DEF) is an emissions control liquid required by modern diesel engines. It is injected into the exhaust stream. DEF is never added to diesel fuel. It is a non-hazardous solution of 32.5% urea in 67.5% de-ionized water. DEF is clear and colorless, and looks exactly like water. It has a slight smell of ammonia, similar to some home cleaning agents. DEF is used in by Selective Catalytic Reduction (SCR) technology to remove harmful NOx emissions from diesel engines.
In January 2010, the U.S. Environmental Protection Agency (EPA) brought in new emissions standards requiring medium- and heavy-duty vehicles to significantly reduce engine emissions, particularly NOx and particulate matter (PM). Vehicle manufacturers use SCR to meet these standards. DEF is sprayed into the exhaust, breaking down NOx gases into nitrogen and water using an advanced catalyst system. As a result most new diesel trucks, pickups, SUVs, and vans are now fitted with SCR technology and have a DEF tank that must be regularly refilled.
EPA set the emissions standards to improve air quality. NOx and PM emissions are associated with a wide range of health problems including respiratory and cardiovascular diseases, aggravation of asthma, acute respiratory symptoms, chronic bronchitis and decreased lung function. The EPA estimates that the emission standards will prevent 8,300 premature deaths, more than 9,500 hospitalizations and 1.5 million work days lost due to illness, saving approximately $70.3 billion by 2030.
SCR is a so-called "aftertreatment" technology, which means that it destroys harmful emissions after combustion. This gives manufacturers greater scope to tune engines to improve fuel efficiency and increase power. Owners of SCR vehicles enjoy greater reliability and longer oil change intervals, which add up to impressive operating cost savings over the life of the vehicle."

If replenishing is the only cost/inconvenience associated with def use, why would anyone want to bypass it? Are there other considerations?
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Old 08-02-2016, 09:35 AM   #12
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Originally Posted by NMWildcat View Post
The new diesels with def get better mileage than the old diesels w/o def. But if you delete all the def crap from a new diesel the mileage and power increase dramatically. My brother has deleted 4 farm trucks so far and that is the result.
I'm certainly interested to know how much a "dramatic" increase in mileage and power is compared to NOx and PM increase. Seems that since the entire technology is "aftertreatment" that it would not be a "dramatic" difference. Just trying to understand...
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Old 08-02-2016, 09:48 AM   #13
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Quote:
Originally Posted by windsurfdog View Post
If replenishing is the only cost/inconvenience associated with def use, why would anyone want to bypass it? Are there other considerations?
I don't think anybody sets out saying, "I wish the air was a little more polluted", but when you have to replace your first DPF (Diesel particulate filter) and it costs several thousand dollars, you look for alternatives. A delete kit is much cheaper, and then you get rid of all future DEF associated problems and annoyances.

You should go to a diesel forum to research this as there is a lot of detailed information there, both for and against.

I'm waiting to buy a new diesel until they get this DEF stuff figured out a little better. But then, my 2007 Duramax might never wear out
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Old 08-02-2016, 01:26 PM   #14
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i get better m.p.g. and if better for the air quality i an good with it
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Old 08-02-2016, 01:49 PM   #15
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Ran up and down the Arbuckle Mountain in OK. People around here say it's a "B...." because of the long incline. With my diesel towing my 10000 lb 5er the truck never shifted out of OD and never tacked over 1800 rpm. You're gonna love you new truck.
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Old 08-02-2016, 02:09 PM   #16
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Originally Posted by locogk View Post
i get better m.p.g. and if better for the air quality i an good with it


Diesel pollutes less than gas. Soot just falls to the ground.
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Old 08-02-2016, 06:03 PM   #17
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I love my 2013 megacab 2500 with the Cummins diesel. The truck has plenty of power to pull my 16,000 pound 5'er. I will recommend that you get some sort of fuel cap for the diesel tank fill however. The DEF fill is very close to the Diesel fill. If you accidentally put DEF fluid into the Diesel, will cause a problem. Don't ask me how I know.
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Old 08-02-2016, 07:20 PM   #18
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With the Ram you have a DEF gauge so there is no surprise's coming when it gets low and you don't notice the message on the dash. And that Cummins is a beast.
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Old 08-02-2016, 07:33 PM   #19
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Well ya made the diesel guys happy Still gas and loving it. Later RJD
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Old 08-02-2016, 07:52 PM   #20
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You are going to like the Cummins. I had a 2005 3500, now I have a 2015 3500. Don't neglect your fuel filters.
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