mines the si, but this is what i got
Gearbox oil - 2l (LT3 oil) - what i use FUCHS TITAN SINTOFLUID SAE 75W-80 SYNTHETIC MANUAL TRANSMISSION FLUID
Diff oil - 1l (SAF-XO) - what i use RED LINE SYNTHETIC MANUAL TRANSMISSION LUBRICANT MTL 75W-80 GL4
also check the diff for a drain plug, as its sealed for life, some dont have one so you need to suck/siphon out