2017 GMC/Chevy DEF tank!

FishOnOne wrote:

NRALIFR wrote:
Personally, I'd rather see my truck use whatever amount of DEF is needed to keep the exhaust within spec's than EGR. Those are the only two viable options when it comes to reducing nitrogen oxide emissions in Diesel exhaust; either reduce the combustion temperature in the cylinders with EGR or use a SCR after-treatment.

:):)

The problem using too much def will cause the exhaust to clog up over time

There's a downside to too much EGR too. Having previously owned one of the DEF-less 2010 Diesels, I can attest to the fact that relying totally on EGR is a poor design. It didn't work out for any of the Diesel engine mfg'ers that tried it.

Those DPF's aren't cheap when you're out of warranty and your truck is cleaning every 60-70 miles because it's clogged. There's also the oil dilution problem those engines had that was excessive even when everything was working right.

The way I see it is that all Diesels from each model year have to meet the same exhaust specs. The NO2 specs are currently being met with a mixture of "in cylinder treatment" (EGR) and "exhaust after treatment" (DEF). One brand's strategy may result in their engine using less DEF than another brand, but make no mistake if your not using as much DEF to meet specs you are using more EGR.

I see no sense in worrying about how much DEF is being used when the cost per mile is as low as it is. I'm only referring to a properly working Diesel engine using the "right" amount of DEF for its design.

:):)