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fascinating
Same as oil choice.
Coolants have different levels of PH (acid), Silicates, Sulphates, Borates and other additives. Each manufacturer specifies a formulation suitable for the metals in the engine, rubber hoses, seals etc.
Nothing to do with whether it mix, perform better, "price", or anything like that (geez guys). Since I don;t own a test lab, and know clap about coolants and the materials used in our engine, I am going to stick to what Porsche Eng recommends 
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
Last edited by Nine8Six; 07-23-2016 at 09:19 PM.
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