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Your decision should be driven by whether you believe driving 700 miles has introduced enough contaminants into the oil, e.g. acids etc., that it degrades the parts that sit in it for several months My guess is fresh oil is the safer choice, but its your car and your wallet.
BTW: if someone places such a high value on one's 986 to preserve it from winter elements by garaging it, why try to save a few bucks over low cost preventive items such as changing roughly 10 quarts of oil.
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