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You can use anything, just make sure its phosphate free and safe for aluminum engines. Coolant WILL destroy the head in particular if its not safe for aluminum.
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
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