Hi Guys n Girls, here's some up to date info on redline gear oils...
All-2001 GTS & GTS-T (single turbo) (R32,R33,R34) RB25 & RB25T Eng, 2500cc, 2WD
Component Recommended Oil / Fluid
Manual Gearbox Select your closest climate range. For -10°to25°C use 'MTL' or 5°to35°C use 'MTL' or 15°to50°C use 'Superlight Shock'. (* Advantage option for Performance / Racing use 'Lightweight Shockproof'.) @ see handbook for Litres Rear Diff Red Line '75W90' Gear Oil (* Advantage Option for Racing use Red Line 75W90) @ see handbook for Litres
SERVICING - GEARBOX, DIFF or AUTOMATIC TRANSMISSION: Change your oil at up to 4 times the current changeout period on conventional oil, depending on type, age & usage; else under warranty, change oil as per warranty specifications. Oil life may be extended in addition to this subject to oil analysis readings. (Testing may identify a mechanical or engineering failure, even when the Red Line oil is still in good condition!) Tip: Automatic Transmissions - Make sure a qualified transmission workshop not only changes your oil but gets all the oil out of the torque convertor as this can hold up to 4Ltrs of your contaminated previous brand oil.
http://www.redlineoil.com.au/oil-finder.asp
UPDATE: from redline australia! The web site info is incorrect (American) the shockproof oils are fine for synchrmesh gear boxes... and they will be udating the web site to reflecting this updated info...
"superlight" for hard driving/track use.
"lightweight" for normal street/track use.
"heavyweight" for normal street use.
Hopefully this clears things up!