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I think the 2005 is the 6.0L Powerstroke. My 2008 6.4L Powerstroke service intervals depends on usage (as do any other vehicle). You fall in the special operating conditions category, and as such, Ford recommends changing your oil every 5k miles or 200 engine hours and changing your fuel filters (both) every 10k miles or 400 hours. Additionally, you have to watch your coolant... there's special procedures for those too at 15k miles / 600 engine hrs.
Everything with diesels goes by engine hours. And if you idle your truck, it adds to your engine hours.
It's a myth that you need to change your oil every 3k miles. If you go look in your truck's user manual, it'll probably tell you it's more than twice that.
You don't need to do anything that your manual DOESN'T explicitly tell you to do. There's a maintenance supplement that comes with these diesel trucks. If you go to Ford's website, you should be able to find it and read it on your own. Asking people here will give you a wide variety of answers when, in fact, Ford knows best because they're the ones that designed the trucks. :-)