there are a lot of 6.0s out there still on the road.. many of them with oiver 300k miles.. as are there lots of 7.3's still out there...
a lot of the 6.0's troubkles came in its first 2 years or production giving it a terrible reputation..
a lot of the 6.0's issues came from neglected maintenance.. ie neglected coolant, oil changes, fuel filter changes...
a lot of 6.0's issues came from neglected maintenance and then running them in Severe duty or worse... all stock parts with programmer chips, pulling big ass trailers in 100 degree heat at 75 MPH, driving the piss out of them, etc...
a lot of 6.0's issues came from people kniwing they had amn issue with say the oil temperature, or EGR cooler / EGR valve and continuing to drive it anyway
a lot of 6.0s took a bad "engine" rap when it was really the POS transmission that was behind it the first couple years... the forum post would read "my F-350 diesel SUX!!!".. first question.. "what motor?".. '6.0' - and they wouldnt read anymore to find out it was a transmission issue...
bulletproofing a partially bulletproofing a 6.0 will make it run for a long long time..!!
though ive been afraid of them in the past, owning a 7.3 (T-444E), the 6.0 No longer scares me... in fact i see short busses with the 6.0;s root-cousin (VT-365) all the time.. often Cheap! because of the perception...
Bulletoroofing a 6.0 isnt for someone who has never turned a wrench... esp in the tight confines of a Van-cutaway skoolie, its not rocket science, but you do have to take a LOT of stuff apart, including disconnecting and removing / reinstalling electronic bits..
the VT-365 is de-tunes compared to the ford 6.0 version so it didnt as often suffer the failures.. 230-250 max HP vs over 300 with Ford helped keep the head gaskets together... Most fleets want their trucks to last so they stick to very strict maint schedules which helped keep the EGR and oil coolers clean...
there are good and bad in ever yused bus / engine.. we have seen people on skoolie buy 7.3's and have dropped lifters, DT-466's that lost the coolant in the oil on thge maiden voyage.. , gas 350s with wiped cam lobes,
a lot of buying a Bus is the perception of that bus... if its pretty well thrashed out on the insde.. outside has a lot of dings and dents... it may have been neglected altogether..
if you can view a bus, or talk to a fleet manager and get info that helps greatly... a fleet manager has no skin in the game when an old bus goes to auction.. its gone from him and he has a brand new bus under warranty in its place.. so he is glad its one less he has to work on.. he has no reason not to tell you "that bus was a POS!!"
-Christopher