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Coolant: GM designed the precursor to Porsches cognac but at about $15 a gallon. It to was supposed to be a lifetime thing but it intact could start to gum up under certain circumstances. They got sued, straightened it all up and now everybody makes a version of Dexcool (chevron, Pretsone,you name it)..
if you research it you find it meets the requirements of Porsche and for all practical intents and purposes is the same stuff: no silica, phosphates, low ph, etc. Once it was a bit of a secret, now Xerex offers a n improved version which actually list modern Porsche comparability.
Have fun PK
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