I just did the gearbox oil on my R32.
I bought REDLINE lightweight Shockproof.
It's excellent.. I can't recommend it enough.
my second gear use to crunch but now it doesn't do it at all.
anyway, that stuff sells for $25 per litre.
I just bought the 3.78L bottle, $100.
The R32 GTST gear box takes 2.8L for those who are interested.
I know $100 sounds expensive at first, but when you consider that you change your oil every 5000kms and if you are using like MOBIL 1 synthetic, it costs you at least $50 each time.
how often do you change the gearbox oil?
It's a very good investment...
I found my one from Croydon Racing Development (or whatever they are called now...in silverwater, sydney)