Note: I hope "coldest weather" means -20f or lower. That's a whole different kind of cold. Nothing likes to start when it's that cold without being plugged in for at least a couple hours. Even then, my 1510 usually needs a couple of heater cycles before it will fire up. Up in this country, most everyone agrees diesels are harder to start in the extreme cold. I never said they won't start, they just take a little more coaxing.
By "The RIGHT diesels" do you mean new? Something with computer chips running everything? I like my old, mechanical engine. Less to go wrong. A little harder to start, perhaps, but very dependable.
Still rather have it than a gasser!
Joe