What is reliability of f250 6.0 liter diesel engine?

Answer 1

The Ford 6.0L diesel WOULD have been a great engine except for 2 flaws: 1 - Ford decided to go against Internationals' recommendations and they used their own fuel pump, 2 - Ford decided it would be "good enough" to use 4 studs per cylinder rather than go with the 6 that was recommended by engineering. These are the most common failures with the 6.0L International, fuel pump or fuel system related troubles or catastrophic head failure, (Yikes!) I work in the Alberta oil patch and I've seen my fair share of problems with these motors. I've also seen lots of problems with both Chev, (failed heads on early Duramax) and Dodge, (failed lift pumps on early HO diesels, 48RE transmission problems from large non-stock sized tires and re-gen problems with new 6.7 diesels.) I also have a few friends with 6.0L diesels who have over 180,000 km and still no major problems. These are the guys who leave well enough alone and treat their trucks with respect. Check out this article http://www.dieselpowermag.com/tech/0907dp_6_0l_ford_power_stroke_engine/index.html and to answer your question I would give it a 8/10 on the reliability scale