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There are 10k+ LN bearings running just fine for years and miles with the seal not there by design. Only immersion at rest and mist while driving to lubricate them. Ball bearings don't want big amounts of oil, they want to not have to push it out of the way.
On the dual rows, if the seal has failed, if it fails enough and if the engine is driven strongly enough and frequently and there is clean oil, there is very often no problem. Have seen 200k miles and when pulled some oil still in the bearing.
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