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I read some of the tech articles on Pelican about changing your Porsche's coolants, and came across a comment by Wayne that said he recommends sticking with Porsche coolant, and furthermore, changing it every few years or so. I had come to the same conclusion about the Mercedes, and had been using only Mercedes Benz coolants for a few years in it. The reason is that the cooling system is designed for that type of coolant specifically.
But I have even gone further, to additionally stick with manufacturer hydraulic oils in the Kubota RTV for example, and Kubota brand brake fluid in that same vehicle. The factory shop manual specifically states to use the manufacturer's, fluids for some reason. I don't think it's prudent to question why. Not for a vehicle costing tens of thousands of dollars. Not in my opinion anyway.
Oddly, for the Porsche Cayman, the manual states that the steering system uses CHF 202, a synthetic hydraulic oil. It does not say "Porsche" brand. I found that Napa Auto carries it. And the Porsche manual does not say to use Porsche brake fluid, only DOT-4.
Get a big ol container at Smart and Final, or some supply house. Mix the recommended amount of distilled water and coolant in a separate container. Use that to fill the cooling system. Follow instructions regarding bleeding air out with the bleeder valve.
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