Lower unit is off a 1994 40 hp Yamaha 2 stroke, has some housing damage as pictures show. Gear oil is old, and bottom drain plug shows little metal shavings. Oil has been drain and have a video of it, oil is dark brown almost black but no metal or water, and seals seem to be good, oil dripped till top vent screw was loosened. Oil does not smell burnt or any strange odor. Does seem to shift well and holds gear, forward and reverse, Water pump housing is still on but impeller is not there.