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If the bearing's seals are intact, there is no place for the grease to go and the IMSB is adequately lubricated. If the outer seal is removed, any grease present would wash out quickly and sump oil would adequately lubricate the bearing thereafter.
The lubrication problem only exists if the seals leak such that oil slowly penetrates the bearing, mixes with grease and the mixture stays there for a long time. Then lubrication is compromised and friction destroys the bearing.
BTW: if all oil was shed due to centripetal force when the engine is running, IMSBs would fail quickly. Real world data shows unsealed IMSBs don't fail.
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