Back when the transmission in my 07 went bad November of last year (I was out of warranty too and it would grind going from 6th to 5th), I purchased a new unit myself. The problem happened when I put in Amsoil 75w90 in place of the OEM 75w85 fluid which was already in So I decided only to use the OEM 75w85 stuff in the new transmission from now on. I know Amsoil is good stuff, and I use it in the engine and with my motorcycle, but I guess these transmissions really are THAT sensitive to the right weight...

I did my research here and found a few people made mention that there was a TSB by Nissan to ONLY use 75w85 fluid in the transmission even though the manual calls for both 75w85 and 75w90. Here are two of the few posts I came across:

https://my350z.com/forum/8149695-post41.html
https://my350z.com/forum/687032-post6.html

I tried my best but couldn't find any 350z related TSBs

http://x.nissanhelp.com/forums/Knowl...html?catid=254
http://www.automd.com/tsb/nissan_m/350z_mm/2007_y/

Neither of these two sites make any mention of this TSB. And the thing is I heard even more people talking about a TSB like that, so I'm sure it's out there, but I just can't locate it. I just basically want to know if anyone could tell me where I could read more about or if anyone heard about this too. 75w90 is even appropriate for where I live, but I'm just curious why there's a TSB when the manual calls for both weights.

Thanks in advance

 

Members of quote TSBs but provide no number. I think they often pull this out their ***. Kind of difficult to research a TSB without a number.

 

yea I was afraid of that