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Your cooling system should be able to handle all sorts of variables, I haven't heard of different oils causing temp changes. It seems plausible, because increased friction would raise temps. But think about all your engine can do without temp fluctuation. If you decided to drive at double the normal RPM, or if it was 100 degrees outside. The temp still stays roughly the same, and should stay in a normal range especially on the highway with max radiator air flow.
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