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Old 06-30-2010, 06:54 PM
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gtxragtop gtxragtop is offline
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Location: Mass
 
Join Date: Feb 2008
Posts: 878
Mein Auto: 2003 530IA
I put an OES (Original Equipment Supplier) water pump in. Out came a composite with 96K miles and in went the same thing. My thinking is that a composite pump impellers can be held to much tighter tolerances than a metal or cast one. So efficiency should be better.

Now if I was to use EVANS NPG+ in MA with -20F temps in the winter, I would have used a metal one so that there is no chance of breakage pumping slush around until it warms up.
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