Being a VM Italian engine, I pretty much knew a Fiat-sourced EcoDiesel would be a disaster for US markets. It was. What a shame first Daimler-Benz bought Chrysler and drained them, just as they were getting back on their feet the Great Recession hit, bankrupting them, and of all possible buyers, horrid quality Fiat took them.
I was at Cummins at the time, and they'd developed the V8 5.0L diesel to go into 1500 Ram. Fiat tore up that contract, leaving Cummins holding the bag and finding a disastrous partnership with Nissan. Fiat wasn't dumb enough to tear up the existing Cummins contract with the 6.7L diesel.
Yep, I read about the 1st gen Duramax 3.0 issues, supposedly fixed on Gen 2? Anyway, all that exhaust crap has pretty much nixed diesels for me. I still run my Yanmar 1.1L tractor engine, EPA Tier II. All it has is an in line injection pump. It's noisy, but powerful and fuel efficient. Nothing earplugs can't handle.