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Artan - to prove your point you need to have the oil analyzed. That will tell you if it is still usable.
When you say "it's fine" - what does that mean? Is 100,000 mi without an oil change enough? If the engine is junk at that point, have you gained anything? You'll have to wait and see.
Have you ever seen stone get worn away by water? Oil under pressure with micro particles of abrasives (metal) will wear away metal parts - slowly, but surely...
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