When a 928 water pump fails it takes out the timing belt, or the block if the metal impeller migrates.
Castings can only be reliably rebuilt so many times, and the rebuilding industry basically killed itself going cheaper to compete with Chinese knockoff parts.
As of a couple years ago Porsche NA had one of the highest parts markup, 40% for the benefit of passing through its warehouse. On many parts the only option is used vs dealer prices.
One of the worst parts of 928 ownership are the cars where the previous owner saved $10 on the wrong part, or paid hundreds more using the wrong mechanic.
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