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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