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OK, here's my take FWIW. If you run your car hard, high rpm, high loads, so everything is really really hot it is highly adviseable to drive for a few minutes at approx. 2,500/3,000 rpm with little as possible load to let things cool down.
Back in Germany after hours of full throttle/high speed runs we always drove the last 2 miles to the gas station at a slower speed to get things to normal. Never a problem!
Idle at a standstill does nothing or makes things worse, air movement is needed.
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'14 Boxster
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