I replaced my coolant two years ago when I updated to the LN low temp t-stat...wish I would have done the water pump at the same time. As stated, if the impeller breaks, tiny pieces get stuck in the cylinder head and cause major issues. I've seen it happen to some friends and it's enough to scare me to change mine as a precaution.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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