So I'm toying with the idea of using GM Synchromesh to do a transmission oil change as I did on my Acura TL back in 2005. Honda recommended of course to use their brand but friends from the TL Forum I belonged tried the GM oil as I did and the shifting was smooth like medicated cotton. I saw on the DIY forums that most of you that have done this use the Nissan brand as well, also I read that the transmission fluid is lifetime on the Z and shouldn't be changed...any thought thanks, BTW I have 32k on my '13 Z and like I said have been wanting to do this for a while...