Transfer Box oil change
Undo the drain plug under the transfer box and drain. 8mm allen key
Leave to drain to get as much muck out the bottom as possible.
Refit drain plug.
Then remove the temperature sensor/level plug in the side of the box.
Then fill via the breather hose in the top of the transfer box.
This should be located by the coolant tank, cable tied to the top
Straighten it out and fit a small funnel to it. Pour the fluid in.
Fill with Vauxhall synthetic 90 443 530 approx £7.00 0.6 l
Refit temperature sensor/level plug.