Ok before I forget what I've been reading so far on gearbox, transfer case and rear diff oils, I'm gonna have to post this for my future reference.
Redline MT90 in the gearbox is OK, it is GL-4, so brass synchro friendly
Redline Shockproof anything is BAD, it has a very specific use, need to know your tranny well, so safer not to use it.
US guys run Redline cocktail mix of 2x MT90 + 1x MTL to thin it out a bit to meet factory spec, this resolves notch shift when cold... non-issue for warm climate in Aus or race cars.
Redline also makes MT85 which is equivalent to the cocktail blend, but people still report not as good as the DIY blend.
Redline also makes MT85 which is equivalent to the cocktail blend, but people still report not as good as the DIY blend.
Factory DiaQueen is GOOD, can't go wrong I guess. Have not read about prolonged use on track.
Castrol Syntrax however is a BIG Question mark. I read people running them in their boxes for both 5 and 6 speeds. Also read people telling others to stay away because it is GL5, a brass syncho eating formula, some sulfur in it eating up any yellow metal or something... Then I see tuners, respected ones too, recommending and using them, including in my gearbox currently.
Either these tuners are not aware? (can't be??) of brass synchro issue or don't think it is a problem??
And it seems people/tuners running it don't seem to care to comment about the issue. I guess it may be isn't an issue since I haven't read anything on premature synchro failure due to the Syntrax.
Castrol SAF-XA is OK for use in my transfer case and rear diff ie no ACD, AYC but with LSD in both front and rear.
So looks like MT90 is a goer for my gearbox.
Will drain and see what state the Syntrax is in too...
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