sometimes my Z makes a noise from the gearbox, usualiy in the first statup of the day.
this noise is there from the first day and the Nissans guy (engineer) told me that is was a "normal" noise because the first models have a defective bearing in the primary-shaft gear box.
he tell me that it wouldn't go bad, the noise would be the only thing i will notice but we will replace it if i decided so. i didn't want my new car with an open gear box, so i didint do nothing, my noise is there from the beginning but nothing bad happen...