My biggest takeaway from the ecoboost 3.5L gas engine is how tough and reliable they have been in heavy duty use. A fleet of 18 passenger vans with that engine I worked on from 2015 to 2022 didn't have a single major mechanical failure. No turbo issues, no valvetrain, lower end, or even transmission problems. Two of them had over 300K miles on them. Oil leaks, minor coolant leaks, coils and O2 sensors sure. But nothing major. Very impressed. That engine will NEVER make the 10 worst list. It's a V-6 anyway.
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