The 6.0 was an epic failure. Check out www.dieselstop.com and just do some searching on them. They were REALLY bad when they first came into existance. But, had a buddy with a new 07 and he had three issues. Two water pump issues and an injector issue... Buddy has the 6.4 and he can't say enough about it. I have the 7.3 and it is actually my second one as I decided to not buy a new 6.0. Glad I didn't... These diesels are starting to be broken in at about 100k... 200k is a little much if priced well... I had mine go over 320k before I sold it - had it from day one new - and sold it to my buddy. He had to replace the tranny after he bought it. I had NO issues and we used that fucking thing all the years of racing and traveling across country. The one I have now has had a few issues. My front hub bearings went bad. Typical of duallies after 100k... Had a turbo go bad. Essentially was my fault. Did the crankcase breather mod and it got packed with snow (while horse plaing with my son in a parking lot) and it built up pressure and blew gaskets and seals. BAD thing to have happen, but worked out, got a bigger turbo, high performance build on it and got a new chip and such... Better than before... I love the Fords, but a friend had a Duramax and it is really nice. Shit, the new F150s are the shit, too...