The early One Series came with the green coolant and the requirment to change every two years just as my old 445 did. I converted both to the Cool-guard II by flushing with wated twice and then doing a final flush with distilled water. One Gallon of concentrate diluted with distilled water finished the job. My Brother-in-Laws 1025R came with the Cool-Guard II and the six year service interval I don't know when they made the change.
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