Suggestions on tranny fluid or rear diff fluid?

[shaun123]

I was wondering the following and figured someone on here could probably help:

1) Is it worth changing the transmission fluid to synthetic, and if so, which one would be the best and when should i do it

2) Is it worth changing the rear differential fluid to synthetic and once again if so, which one would be the best and when should i do it

3) Which oil is most preferred? Amsoil, Royal Purple, Mobil 1 etc for use in the Nismo

My car has less than 1,000 miles on it and my friend is a service writer at a nearby mechanic shop and said he could get the tranny fluid and rear diff changed for me for $58 each (labor only) and would give me a discounted price on the fluid, but they can not get Amsoil so i would have to go through some other channel to obtain it if you guys say it is the best to use.

Thanks for any of your input, much appreciated

[jmark]

For the engine oil go here.

http://my350z.com/forum/vq35hr/30038...-analysis.html

[DavesZ#3]

There's no harm in changing out the trans and diff fluids to synthetics. In fact, you'll see an increase in MPG at a minimum. Royal Purple or Redline preferred.

I wouldn't waste the money on synthetic engine oil. You're better off with frequent changes using a name brand petroleum based motor oil.