Seems normal for B3s, mine's done it for 4 seasons, but will pass a pressure test easily and never shows signs of leakage on the outside or on the water surface around the drive. Not sure why it's normal, but I suspect it's because the counter-rotating prop shafts have much more seal area than a single screw design. More seal area, more chance for seepage. My other thought is that the B3 runs hot and the lube evaporates into the bilge compartment. I check mine all the time and carry a quart of Quicksilver gear lube at all times.
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