Ford doesn't offer an optional engine in the Expedition. Sales are around 40-50K per year. So that is 200-250k engines. I have not heard the f-150 version having major issues, like the Expeditions. The EB's engine reputation is already sketchy. They are on the 3rd generation and still having issues. GM's Tahoe/yukon optional 6cyl is a diesel.
I was including the f-150 sales in the general count. I know expy’s sale are well below 1 million, probably over the last decade, even (including NON EB expeditions).