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The water pump impeller rides on a bearing pulled by uneven forces.
All rotating parts wear.
All failures occur somewhere on a bell curve which means yours could be the first or last.
Metal to metal, the stronger one wins.
Some things made in Germany are well made. Today my wife is really POed at the expensive German iron that just failed after less than 2 years.
When it fails, it will usually fail just out of warranty. Murphy will get you.
Experience quantity one mean little in predicting performance in quantity. (Hear that before Jake?)
What is a pumps service life? Why should you need to even replace the original?
Good luck in whatever each of you choose to do.
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