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When I was a child my dad had a '68 Mercury that was used basically for longer trips for the first several years of it's life. He changed the oil every 3K miles regardless of elapsed time and this was back when oil wasn't as good as it is today. When he sold the car it had 168K miles on it and if I recall correctly it wasn't using but about 1/2 quart of oil between changes.
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I think this is the key reason the 3000 mile change interval is still with us in this day and age of far better oils AND engines: momentum. Plain and simple momentum. For every story about a long lived car with excessively changed oil, I can give one about a long lived car that didn't have lots of/regular oil changes.