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I have no idea what any of you are talking about with going 7500 miles between oil changes. I change my oil and oil filter every 3000 miles. I use Valvoline Max Life Full Synthetic and I do the oil changes myself. In all my automotive training courses and among all my mechanically minded friends I've always heard the 3000 to 5000 rule, but I've never heard of people going 7500. The oil gets dirty enough after just 3000.
on high mileage engines, the oil only needs to be changed ever 3k miles if you are using reg oil. but if you run synthetic, you can get 5-8k out of an oil change. at least thats the way i learned it. i currently run reg motorcraft oil and filter but am changing to synthetic and K&N filter on the next change (this weekend). i have 110k on my 01 EB.