I have clocked 67,000km with no gearbox issues but have read it would be a good idea to replace the oil well before the 100,000km. I notice people have been using fully synthetic oils either Castrol Syntrax 75-90 or Redline MT-90 in 1L bottles. It is a costly exercise in using 1L fully synthetic oils, Scotts Auto 1 catalogue indicates to use Castrol VMX-80 (4L) in the MPS gearbox. I have used the VMX-80 in a race car & in my 4WD with no issues. Has anyone used the VMX-80 in their gearbox ?