Old stories.
By the time the water pump is actually wobbling enough to mill the block, it'll be making noise and probably leaking. Shame on you if you continue to drive on it.
Is it better to have the plastic impeller shred and scatter all over your cooling system? You know, block entire cylinder head cooling ports... you know, stuff like that.
Pick your poison.
OR, a third option. Change your plastic water pump every 15,000 miles.
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