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The problem with time is that crankcase blow-by gasses accumulate in your oil and it starts to become acidic. It may look perfect, but it's slowly eating your engine.
One a side note: I work at an oil-change shop, and I laughed at the idea of someone telling you that you didn't need a service performed that you wanted. We'll push stuff at you if there's so much as a speck of dust in fluids, especially if it's beyond the reccommended service interval.
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