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compatible antifreeze for 2000 Boxster s

  • 2000
  • Boxster S
62 000

my recently purchased 2000 Boxster S must stay in Pinetop, AZ, elev. 7200ft, over the winter in an unheated garage space.  I checked the coolant, light green/yellow, in color and it only tested to 0 F which is not enough for my peace of mind.  Local auto parts store offered PentoFrost SF and Amazon has OEM Recochem 86-314POEMVW Pink Premium Antifreeze Concentrate Extended Life - Euro II Pink.   By phone Porsche parts man said OK to mix pink Porsche branded coolant with existing light green/yellow, it would be ugly brown but would provide adequate protection and would not harm the engine.

Advice please re either or another product.

Thank you, pbh

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