lower unit oil for Mercury 18xd

[dwfizer]

Does anyone know what mercury recommends for lower unit oil for my Mercury 18XD? I am gong to replace it this weekend and dont really know what to replace it with. Thx

 

[ThomW]

With a 18hp, the merc or quicksilver 85W90 lube would be fine. I always use the high performance SAE 90, but that isn't really needed for an 18XD.