I have a ecodiesel, zero issues, zero check engine lights. Great mileage. Tows great and still gets great mileage towing. It is a complete dog compared to my old hemi. I wen from hemi with 3.92 to 3.5 ecoboost with 3.55 to 5.0 with 3.72, and now 3.0 with 3.55 and can honestly say the 3.0 is by far the slowest of the bunch. but its also a truck, so who needs to go fast in a truck?
Only thing I have to be mindfull of is driving to much city somtimes. I have gotten the filter full message twice, but if you do what the screen says and drive at highway speeds for 15 minutes, it cleans itself out.
With respect to the premium of the ecodiesel, you get that back on resale. Atleast locally you do. Same as a cummins. Same as the hemi vs 3.6. They are worth more used...
DEF never crosses my mind. It goes through so little of it. I have only filled mine once. Just about due for second fill up of it now. Lots of places have it at the pump now so its nothing to worry about.
Oil changes are pricey because engine takes 10.5 but thats also part of the reason they can be stretched out so far. It has a huge oil capacity. Follow MFGs for maintance and should be nothing to worry about and cost vs hemi is nearly the same with a huge savings on fuel. Ecodiesel having a higher up front cost.
If your doing mostly city driving id get 3.6, if your doing lot of city going but pull decent loads id get hemi. If you do highway going can't beat the diesel.