I know of many 7.3s with over 500K. Same with the earlier 6.9s that are just about the same engine. That being said, I've had a few GM 6.2s make it over 500K.
I think you are hearing the doom-and-gloom about the 6 liter engine - which Ford DID have many problems with. Ford is also involved in a law-suit with Navistar.
The new 6.4 - as least according to tests- is supposed to be an incredibly rugged engine. In reality - who knows? Makes no difference to me - since I'd never pay more for a truck then my farm cost.
Heavy duty auto engineers rate engine life with a "B" rating. For example, a B10 rating of 200,000 miles means - only 10% did not make it that far before a major teardown - and 90% did make it. And, that's with heavy duty use - not just cruising the highway empty.
The Ford 7.3 - or it's heavy-truck version T444E, has a B10 rating of 200,000 mile and a B50 rating of 350,000 miles. So, half make it to 350K while being worked hard.
The new Ford 6.4 liter has a B10 rating of 262,500 miles - and a B50 rating of 375,000 miles.
Chevy Isuzu Duramax has a B10 rating of 220,000.
Cummins 5.9 has a B10 of 250,000 miles and a B50 rating of 350,000 miles.
The new Cummins 5.6 liter V8 is rated with a B10 of 325,000 miles.
Note that none of them come close to the Isuzu 6H that is used in some medium duty trucks. It has a B10 rating of 410,000 miles.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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