patinlouisiana
Baton Rouge, La
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Saw a commercial that stated there truck did not use DEF.
What the heck is it and what trucks do use it?
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Dennis M M
Geneva, IL; Tucson, AZ
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DEF used for emissions control in newer heavy duty trucks, not sure about light duty.
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dreeder
Castle Rock, Co
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GM and Ford use it as well as most over the road commercial vehicle's. Ram uses it in there 4500's and up but not in there 2500 and 3500's. Although it is not a selling point IMO, Dodge sure tries to sell it off as one. One day, hopefully in the next year or two, they will jump on the bandwagon with everyone else.
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patinlouisiana
Baton Rouge, La
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Does it affect power or is it just an environmental issue?
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mike4947
N. Syracuse, NY
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From our folks in the extended camping family that have upgraded their TV lately most are actually reporting more power from comparable sized engines. The use of the DEF allows the builders more leverage to tune for power/mileage than with previous econ solutions.
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dreeder
Castle Rock, Co
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patinlouisiana wrote:Does it affect power or is it just an environmental issue?
I haven't owned a DEF equipped truck but I owned a problematic DPF equipped Ram. It seems that the DEF equipped trucks are in the neighborhood of 3 or 4 mpg's better than I was getting with my 09' Ram. It is an environmental issue (EPA), as far as power goes, today's diesel's are more powerful than ever.
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ricatic
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patinlouisiana wrote:Does it affect power or is it just an environmental issue?
Both...The non-use of DEF by Dodge requires significantly more EGR events to meet emissions. The additional EGR activity increases soot production. This increased soot production fills the DPF more frequently which requires more active DPF regeneration. More regeneration burns more diesel fuel which lowers fuel mileage.
The general consensus is that this active egr and dpf cycling is also why the Dodge does not perform as well as the GM or Ford on the various magazine shootouts. The Dodge runs well and does a great job of towing the trailers but is measurably slower in the testing.
Is the lack of DEF important to a purchaser. It depends. I will be replacing my problematic 2011 Ford 6.7 soon. GM or Dodge? It depends on two criteria. Gm needs to upgrade their cab size and comforts...and Dodge needs to go to DEF emissions control. For me...no DEF is a deal breaker...JMO...YMMV
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carringb
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ricatic wrote:
The general consensus is that this active egr and dpf cycling is also why the Dodge does not perform as well as the GM or Ford on the various magazine shootouts. The Dodge runs well and does a great job of towing the trailers but is measurably slower in the testing.
Not to mention the lower fuel economy due to regen operations. In some case, like my fleet (which runs predominantly in town with frequent idling) the extra fuel burnt is significant, and also causes engine oil dilution, forcing very frequent oil changes.
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path1
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Will be interesting to see how these DEF things work out in next several years.
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ricatic
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path1 wrote:Will be interesting to see how these DEF things work out in next several years.
While I agree that there will be some things that may have to be worked out, this is hardly new technology worldwide. Def emissions control is not new technology. It has been used in Europe for several years.
So far, in the two years that the technology has been available in the Ford, minor programming changes and a persnickety NOX sensor have been the only problems. GM has had similar success, and the same problems, during their 1.5 year run.
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