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Old 07-13-2011, 11:00 AM   #4
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
The reason they are telling you this is twofold:

1. The main mode of failure of a water pump is bearing wear out. Cheaper bearings=more likely failure.
2. When the bearing does fail and the impeller blades contect the engine housing, on a plastic pump, only the pump is damaged. Metal blades will damage the actual engine block. $$$
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