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Being filled with oil...sure. If the inner seal allows hot oil in and the "grease" initially installed gradually leaks out. Depending on the quality of the oil in the sump and the type of driving the car has been doing, the oil has been frequently been reported as seriously degraded and smelling as overworked oil will. There have been numerous online pictures of removed bearings dumping this gunk with descriptions from the person who removed the bearing. They show this obviously compromised lubrication.
I don't recall any of the folks trying to introduce a replacement bearing describing any other phenomena. So look at the LN, Casper, Hartech and Pelical sites and see wht they say after probably looking at more samples than the average mechanic might see.
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