Choices are getting thin when thinking about replacing our 6.0 trucks. The 6.4 engines are getting terrible fuel economy per everyone I have talked to. They have been holding up, but bad fuel economy. 9.8 mpg, empty is not very good.
The new 07 and 08 6.7 Cummins engine is to new to tell how well it is going to hold up. Chevy is not even a consideration. Because of the new smog laws, any new diesel engine is going to have a bunch of emissions junk on them. That is the main reason I bought the 06 PSD.
So I am hoping that Ford will come up with all the fixes for our 6.0 engines in the near future, so they will last the 300,000 miles that they should. I have not had one problem yet, but if I do in the future, I would consider replacing the engine with a 5.9 Cummins if Ford does not make our engines bullet proof.
A good test will be the 10,000 mile trip pulling the 5er next year. If I do not have any problems, then I will be happy. So far, 8000 miles and no problems. My truck is pure stock. No changes yet.