Im planning to do some of the 30,000 miles services to my 350Z

1. Since I have 06 350Z 6MT Base (no LSD; open differential), do i still have
to change differential oil? if yes, what do you guys think about the
Amsoil's product?
2. My people said that there is no In-Micro-Cabin filter for 350Z, so there
is no need to change it, is that true?
3. Does it required to change Manual Tranny oil at this time? if yes, what do
you guys think about the Amsoil's product?
4. I was planning to put amsoil's antifreeze/coolent vs prestone 50/50
prediluted. It is like Propylene Glycol formula vs. an Ethylene Glycol
formula. Does it give really differences? Prestone is way cheaper than
Amsoil's

 

1) Yes. Overpriced but any synthetic will do.
2) True, no filter.
3) Yes. Overpriced but any synthetic will do.
4) Buy the cheaper Prestone.