Motul 300 gear oil is top notice stuff. Similar to Redline. Esther based, GL5 rated and high sheer capability.
I use Redline MT90 in the GB which is similar only as i get it much cheaper then RRP - see my sig links. Today I flushed the GB on my 33, 4 Quarts for less than $80! RRP would be double. .
I also use the redline 75W90 gear oil in the diff, great products with great results. I also have the stock VLSD