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I've asked the same question about my Nissan, which is at 180k and 12.5 yrs. old. My wife's uncle who just replaced a VQ's water pump on a '96 said he believes it's a function of the coolant, as well as mileage. In other words, replacing the coolant at recommended intervals is going to prolong the life of the pump as it has lubricating properties. So on a properly maintained vehicle it could go for quite a while.
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