Gearbox oil

[JackoGQYoot]

Hi all
I am looking to change the gear oil on my GQ TD42.
Which oil have you guys found works best, and how much of it will I need to do Gearbox and Transfer case?
Cheers

[garett]

for gearbox i'd go with a GL 4 grade over a GL 5, i think its 80-90.
transfer i think is 80-90 gl5
i'm using nulon as was the only gl4 i could get easily

[billyj]

always ran castrol vmx-m with a tube of nulon g70 in my gq, was the only oil i tried that made it shift any good

[MB]

Blokes at our nearest Semi-Rural ‘Burson’s’ also swear by them Nulon tubes too BillyJ mate!
They reckon its the only stuff that gets their Land Crab boxes shifting without hassle. Did buy a tube once too and might give it to a close work mates GU having highway 5th <>4th issues and see what may prove too!


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[JackoGQYoot]

Just found out I will need 3.9L for the gearbox and 2.2 for the transfer. Do you guys reckon I go for the full synthetic oil from penrite or the mineral from castrol? I've been told that a 4L from Penrite will be 62$ and I will need 2 of these. It seems pretty expensive but I am leaning towards full synthetic.

[billyj]

im normally a penrite man but the castrol vmx-m was the only oil that got the old girl shifting any good

[92GQ]

I've been using the Pro Gear 75w-85 from penrite for years.
What ever you choose, it must be a GL-4.
GL-5 jams the syncros in a GQ manual transmission.

[Waadles]

Castrol vmx

[JackoGQYoot]

Cheers for the replies. Ended up going for Penrite GL4 as it worked out cheaper anyway.

[Ben-e-boy]

Castrol VMX is the only oil I've used to make it cold shift properly. No need for an extra additive as it is already in the oil