What oil for GKN diff in my Griffith

[Barreti]

Hi chaps,

Spotted a little leak from the diff seal while I've been grovelling around under it. Nothing to worry about for this year but I don't know how much oil I've lost so I might as well drop the lot out and refill while I've got easy access with the body lifted.
Can anyone recommend an oil for the GKN diff and how much I should get?
Its got a drain on the bottom and a refill plug on the offside if thats any use.

Ta
Ian

[Barreti]

Thanks LG, I'll look that stuff up.