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My own anecdotal evidence is that the water pump is the most frequent failure and fairly predictable. I've replaced 4, 2 myself and 2 by my mechanic, averaging about 1 every 50000 miles. Pretty sure a couple of them have been with metal impellers. Point being that a failing pump with a metal impeller doesn’t necessarily spell doom for the motor. That said, I’m more aware of the issue and would choose a plastic impeller in the future.
The pump surprisingly easy to replace given its location. I'd recommend to anyone planning to have the car a few years to keep one on the shelf and replace it yourself.
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