Is it better to use the

Redline 75w90 with friction modifiers
http://www.redlineoil.com/product.aspx?pid=133&pcid=4

or

Redline 75w90 NS without friction modifiers
http://www.redlineoil.com/product.aspx?pid=47&pcid=7

in the stock differential with VLSD?

Thanks

 

to my understanding it's supposed to GL-4 oil,which would be MT 75w90 gear oil...........I believe GL-5 can mess up the syncro's .someone with better knowledge will chime in soon

 

The synchros in the differential? I think they'll be fine.

 

No friction modifier is needed with a VLSD, the VLSD unit has its own fluid.

 

anyone with insight on the ns fluid? My diff had a whine(os superlock) so I tried redline fluid to see if it would quite it down. The ns says it quites noise diff's and can be used with lsd's but now my diff is noisier than ever. Anyone else try this? I am thinking of going back to motul ls 300.

 

Use the OS stuff.

 

Run the heaviest stuff you can find, right now i run Amsoil 75w140, next i may run Lucus straight 140 or 250 for my OS unit.

 

Thanks. I removed the ns fluid though, it make the diff howl really bad. When I switched it to regular 75w140 redline(the one thar already has a friction modifier in it) It was quite again. It still whines only from 60-65mph, so I am having the shop look at the os next week

 

that would be ideal, but it adds up when you take into consideration that the fluid is exhanged every 2500-3000 miles. It does not seem like alot but my maintance is currently at motul 300v oil change($115), motul 300 gear(trans $90), coolant($40) and then the diff fluid($60). All done within 5k miles or after each track day I no longer dd the car so that's a plus

 

Is the fluid breaking down or are you changing so often to remove free range friction materials?

 

3k miles is the maintenace interval instructed by Os Giken. Also Motul does not recommend 300v used longer than 3k or after a track day(what motul rep told me).

 

Those instructions read like stereo instructions. I read it as first change at 3000 or first track day, then factory (Nissan?!) intervals. Good to know, I bought a bunch of the OS stuff before California starting being a ***** about out of state taxes.

 

It's first change of fluid within 300 miles(break in period)

 

I think your missing a ZERO , you need to change it every 25K to 30K. I track mine and used to DD it till a month ago.

 

lol i know right? i know for our race dirt bikes they say it needs a topend rebuilt every 4 races and they can easily make it to 16 before you notice any kind of drop in performance. (i ride B class and am not so easy on the bike either lol)

 

Wow...well I feel dumb I should have read the instructions twice before tossing them

 

Talk to OS, they told me to go beyond 30k , even with track abuse.