recently bought another (stock) 2006 350z, been driving it for about ~2000 miles and listen to this stuff.
the car currently has 99,2XX miles on it, not super high by any stretch of the imagination. I'm just waking up getting ready for work and step outside and get in my car. put it in reverse, back out of the driveway, shift into first and get going. first stop sign comes and boom, stuff goes down. i push my clutch in and i feel no tension whatsoever, and it sticks to the floor not coming back out. well unfortunately i have to stop the car so i just rip it into neutral with no clutch (not advised). and knowing that this problem is commonly caused by a leak of clutch fluid or a forgeted up slave cylinder, i start pumping the clutch to see if i get any tension at all. no loving luck. so i push it off to the side of the road and pop the hood. checked the clutch fluid, bingo, low as forget. so i do the thing nobody should ever sensibly do but everyone does, i scoop some fluid out of the brake system and try to give as much pressure for the clutch as possible hoping there are no air pockets from whatever is causing it. start driving and everythings going okay, two miles later it does the same stuff again right through an intersection. well long story short it got towed and im sad once again the loving stuffty transmissions they put in the 350z. the loving thing isnt suitable for a toyota yaris with 98hp nevertheless and sports car pushing 300hp.