A fleet of Ecoboost 2015-2016 Ford Transit 350's I service have been wonderful on the engine and transmission side. None of them have had ANY serious mechanical issues to engine hard parts. Some of the 2015's have over 200K miles on them now. Body hardware, sliding doors, chassis electrical, steering columns, brakes are another story. All the above items need constant parts replacement from just general low quality components and undersize components. But the engines have been great. We maintain them with only full synthetic oil and religious oil changes at 5000 miles, period. Changing oil when the oil life monitor tells you to is asking for trouble IMO, like oil in the turbo's, and dead bearings.
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