In my 2 Volvos, the front AWD PTO(Volvo calls it an angle gear) they spec a 75/85 or 90. No idea if OE is syn. or not. These run HOT. Hot enough, that when tracking the one , for 15 min stints, it started to melt the sticker off the case. They only hold about .8L. I wonder if I would be better served by going to a 75/140? I did swap them both(and rear diffs) to amsoil severe gear 75/90.