For the 6.0 you only need a few inexpensive items like 8 spare injectors, a spare turbo, spare EGR Valve and maybe even the more expensive items like a fuel filter.
I don't have the correct answers for you Ranger, but the guys with early build 6.0s might agree with that first sentence. This motor seems like one of those things that if you have a good one you're gold but if you get a bad one you can't get keep it out of the shop or get away from it in the end.
Thank you for the sentiments, and you could be right... The Importer has been the Ford Fleet Compliance Guy since 1992. He gave me the history of the 2003, 2004, and told me about the turbo clearance problems and what they did to fix it, machining on the turbo itself, some corrosion problems if left set too long, etc.. He claims the turbo problems were fixed in the 05 and my 06 by Ford increasing the clearances on the inner part of the turbo housing. He also claims to have the technical details on the EGR, and why the early ones up to 05-06 had the problems but why the 06 did not have the problems. I could ask for the Technical details if anyone wanted to know. But evidently the injector problems, turbo problems, and EGR problems were sorted out in the first three years.. And now problems are much more rare...
And yes, all new engines and new trucks have teething problems, I have seen it over 50 years. In all fairness the same Rep told me to stay the hell away from the new 6.4 and let it settle in for the first two years as well... Mind you it would take that long for us to get them here to be Complianced anyway.
But I think my source is Credible, maybe Marc can jibe in here with his perspective on it, see if he agrees with the Ford Fleet Compliance Rep for Australia. From my experience, Marc is a pretty straight whiz on this tech stuff....
My guy volunteered all of that history, and you are right it is a hit and miss thing, but according to him it is sorted out now. I will get more engineering details if anyone wants it, but he convinced me by telling me how the mods evolved to meet the problems encountered.
Regards from Oz, Ranger doing research on several fronts.... As I advise my own Fleet of about 100.... to the best of my poor ability..