FWIW, I never replaced my water pump pre-emptively, and at 59k miles, it failed after 8 yrs. it gave me signs of failure (weeping under my car) so I wasn't stranded. Replaced with the factory unit, and I'm now at 73k (9 years later), and still good. At this rate, I'm sticking with the factory unit.
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Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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