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Jake, I can understand how on the intital start-up after assembly, there would be air in the bearing housing that could lead to some minor aeration in the oil. However, once the engine is running, the bearing is receiving a flow of oil under pressure and there should be no air left in the bearing. And certainly, there should be no air able to get into the bearing unless it has been improperly sealed.
Correct me if I am wrong, but shouldn't stirring of the oil by the spinning bearing only lead to aeration if there is air present that can get into the oil.
Brad
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