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Not sure what you are trying to say here. Oil is "nasty" when you change it, regardless if it's been in the engine 3,000 or 15,000 miles. It is oil, it runs around a hot engine, picks up contaminates, and gets dirty. It is supposed to be “nasty”.
What you need to understand about oil is that it never loses its lubricating properties, what does happen is the oil gets contaminated, and then begins to sludge. Once sludge starts, it clogs the oil passages to the internal engine parts, which are then starved of oil and begin to prematurely wear and get out of tolerance. Most people think the oil, as it gets dirty, becomes abrasive and causes wear, which is not the case.
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