There would not be another equivalent to this oil for the transfer box because 2 liters and the delivery in France it comes back to 58 livres sterling, it's a bit expensive.
I found it cheaper on a German site, besides Ravenol comes from the bottom. I'm getting at 40 euros (34 livres sterling) for 2 liters.
I will also look for a partial emptying of the automatic gearbox because it has never been done.