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Open seal ball bearing IMS are lubricated by splash and mist, not immersion once running. They have gaps through which the oil mist can penetrate. But solid bearings don't have the gaps spaced the same way.
There have been large single bearing engines that had failed bearings. Thankfully not as many percentage wise as the smaller 1st and 2nd gen bearing engines. And smaller total numbers of failures because fewer cars with those bearings were sold.
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