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It certainly depends on use. I have done many (multiple dozens) 12 hour days of driving in 100+ degree heat. The engine is 215 oil temp, and the engine heat and the rotational parts in the transmission have to add heat as well running at 75 to 85 for long stretches.
I change my transmission fluid every 10,000 miles as I do autocrosses, and HPDE track days as well. Oil is a lot cheaper than a 915 rebuild.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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