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Don't recall where I saw it
The VS is filled with some sort of oil and you should expect a certain amount of leakage.
It makes sense to use a seal that allows a small amount of oil to leak past in order to keep the seal pliable. It also keeps the shaft area clean so the seal doesn't score and let the water in. It is actually a pretty difficult application, you have the potential for negative pressure inside the gear box and positive pressure from the water outside.
Hope that helps
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Threaded Mode