Hmmm, were you driving the same way during each trip? I've mainly found that 80+F temps combined with spirited driving and intermittent gridlock traffic get my oil temps rising the most. Assuming your driving style was identical, I'd certainly expect your temps to go higher during the day than at night due to road heating...the air entering the engine bay may be much hotter than 80F if the asphalt has been baking.
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