diesel maintenance questions

Maintenance on my 2500HD diesel was maybe $70 more a year than on my 1/2 ton gassers. At most. Really, everything else was a wash, although I did change my own oil and stuff like that, so that helped, and my 6.6l Duramax only took 10 qts of oil and no DEF. But regardless, I wouldn't think the maintenance would be a significant cost, all things considered.

I never had a problem starting or with fuel gelling, even at temps down to -20*. Never plugged it in, only an occasional bottle of fuel additive for some reason (I could never tell a difference).