My Moser 3-link rear came with a couple of sheets of instructions for break-in and brake installation advice, but nothing on what oil I should use. The FF assembly manual lists 80W90 with 4 oz. of friction modifier. Moser's web site FAQ lists different fluids based on the specific assembly (Eaton, etc.), which I'm embarrassed to admit that I have no idea what is in the housing. Here is a picture:
As always, I'm at the mercy of the experts and appreciate your advice.