My Z is just shy of 10K miles on the odometer. I have been running the Redline 5W-30 oil since the 5K mark. I have not seen a noticeable difference in the oil temps but it never exceeded about 235-240 in spirited driving even with less than 5K on the engine. I don't think a valid opinion could be drawn regarding the oil and temps until car had a lot more than 10K miles on it. Many report that as the engines break in, temps drop a little.
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