5W-30 OK for Alaska in 2.8L GM Duramax?
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Originally Posted by T-Stick
I was not asking if it had a DPF (Diesel Particulate Filter) but whether it uses the DEF fluid (Diesel Exhaust Fluid) and uses regeneration cycles like a larger diesel. So while they are similar in that they both regenerate the use of DEF with the DPF was part of the problem they were having. The DEF was gelling in the cold temps and causing regen problems.
It appears to me that you think DEF is part of a regeneration process. If so, you misunderstand the operation of diesel emission systems. The SCR and DPF are separate mechanical components working independently by different processes.
DEF is injected continuously into the catalyst(SCR) and reacts with NOX to form N2 and O2. It is not regenerating the catalyst in any way.
The DPF is regenerated when the back pressure in the filter reaches a certain level. Extra fuel is injected either into the combustion chamber or upstream of the DPF to raise the exhaust temperature enough to burn the accumulated soot off of the filter matrix.
![[Linked Image from dieselforum.org]](https://www.dieselforum.org/images/dmImage/GraphImage/SCRGraphic-v3-nocaption_website_opt.jpg "[Linked Image from dieselforum.org]")
Ed
I was not asking if it had a DPF (Diesel Particulate Filter) but whether it uses the DEF fluid (Diesel Exhaust Fluid) and uses regeneration cycles like a larger diesel. So while they are similar in that they both regenerate the use of DEF with the DPF was part of the problem they were having. The DEF was gelling in the cold temps and causing regen problems.
It appears to me that you think DEF is part of a regeneration process. If so, you misunderstand the operation of diesel emission systems. The SCR and DPF are separate mechanical components working independently by different processes.
DEF is injected continuously into the catalyst(SCR) and reacts with NOX to form N2 and O2. It is not regenerating the catalyst in any way.
The DPF is regenerated when the back pressure in the filter reaches a certain level. Extra fuel is injected either into the combustion chamber or upstream of the DPF to raise the exhaust temperature enough to burn the accumulated soot off of the filter matrix.
Ed
Originally Posted by PimTac
Is there a cold weather package that may not have been offered since the OP lives in California? In colder regions that option might be the norm.
That would be some serious malarky if they conditioned heated filter to cold or hot package.
Is there a cold weather package that may not have been offered since the OP lives in California? In colder regions that option might be the norm.
That would be some serious malarky if they conditioned heated filter to cold or hot package.
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