oil
According to my local supplier
For my mav
Main gearbox 3.5 litre 75W/90
Front diff 80/90 1.5 litre
Transfer box 2.5 litre
The Comma site will give you correct type & quantity
I took some pics as I filled my gearbox, tip warm the oil first, I put the 5 litre can in a sink of hot water
I got a metre of plastic pipe from B&Q, cut the bottom off empty litre bottle, & attached pipe, tight fit, fed it down alongside exhaust, held it in place with a couple of bungeys & a bit of wire see pic
I took more pics but can only upload 1:doh