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Distilled plus water wetter works fine and the only downside I can see is losing some of the corrosion protection from OEM coolant that protects your T-stat, water pump, and internals. All coolant should be changed periodically as it does get contaminated over time. Following thstone's schedule makes sense to me.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 11-15-2017 at 06:34 PM.
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