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Old 11-10-2008
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The only reason I say that you should probably change the impeller out every year is that if the impeller is run dry at all, it will generally "age" much more quickly and become brittle with the heat caused by running dry. This tends to leave it more vulnerable to breaking off vanes and can cause you serious problems by blocking the cooling system. Also, many impellers will take a set when sitting in the same position for extended periods of time... which also makes them more prone to losing vanes.

BTW, if you've had to run the engine dry for any reason, it is probably a good idea to change the impeller as soon as possible for the reason I mentioned above.

If you're careful about removing them, you can always set the old impeller aside for use as an emergency spare.
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