I have the 5.4 in my FX4 expedition. I had the 100k service done and was dreading the plugs popping. My local guy, not a ford dealer, got them all out in one piece. His guidance is that every 40k they should be replaced as cheap insurance. She's got 120k on the clock right now, still running great.
Every car company has had their issues. I have a GMC Acadia as my daily driver, that's been in the shop more times than I can count and I only have 27k on it. The most recent was it wouldn't start due to carbon build up in the throttle body. Luckily GMC has a TSB out for it, known issue that ISN'T covered under warranty. Granted it was only 200 bucks but still, the thing is only 2 years old.
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