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I wouldn't worry too much about driving in higher temperatures and engine cooling. Been noted many times online the F80/F82's cooling system is very efficient.
Last month drove my M3 to Tahoe from the Bay Area with 3 other passengers and the temperature that weekend was 100F. The car did drop in performance at higher elevations especially in the mountain, maybe because it was the thinner air. Car's performance returned to normal the next day. Likely the engine management system knocked down some performance so the car wouldn't overheat but still strong enough to pass some slower cars on the changing lanes on Hwy 50 thru the mountain passes.
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