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Take a look at the May, 2014 Tech Notes in Excellence Magazine. There is a good write up on this debate under "Anxious Pump Watcher". Here is a quote,
"Although one problem is solved with a metal impeller, it creates a worse situation, because the crankcase cannot be repaired."
They suggest replacing the pump every 50,000 miles or every 4 years, whichever comes first, and use the Porsche genuine factory pump. They go on to recommend a complete drain, flush and refill of the coolant system every two years. Too many bad things can happen when a metal impeller comes loose.
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2001 Boxster S Lapis Blue
TS Cat Bypass Pipes and exhaust
iPad Mini Dash Install
DEPO Tail Lights
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2001 Boxster S
Hybrid Mode
