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Metal shavings do not tell you when they got shaved off. Sounds like a loose chain sometimes in the past.
If you're running green coolant, the waterpump becomes a consistant failure point since the seal is on the coolant side and green coolant with additives is abrasive to that seal. I'm running Cat ELC nowadays which is supposed to make the pump last the duration of the coolant. Ate a pump seal every 4 years, so I'm good at replacing pumps.
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