The fluid boils/gets too hot and causes air bubbles in the system. The only reason the clutch pedal will go to the floor is because of poorly bled clutch or faulty clutch cylinder. The clutch cylinder lines go out of the bell housing along the side in between the transmission and the cats. A lot of heat gets trapped right there causing quick fluid breakdown. I don't personally think the clutch needs to be changed unless your pedal is working fine but the car just won't go into gear. It's not rocket science but I think this is a serious problem that Nissan should address on a global scale. There is an aftermarket CSC as well as steel lines and high temp fluid. I think when I finally get the parts that I am going to try to isolate those lines and wrap them or something in order to block some of the heat. I don't race but my car will get hot and I can't afford to have my pedal on the floor and the car stuck on some highway.
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