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I did a little experiment with a ball bearing. I purchased a sealed ball bearing similar to size of an IMS bearing and removed one seal and washed the grease out with WD40. Then I placed the bearing in a jar, remaining seal down, and filled the jar with 5-30 motor oil to the top of the bearing outer race. 12 hours later the oil covered 50% of the balls. 18 hours later the oil level was the same on the inside and outside of the bearing.
I know this isn't a scientific experiment, it is not the exact bearing used for the IMS, not the same conditions as inside the motor. But it does make me think that the grease in these bearings might be gone within hours of operation.
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