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8% of single row IMS bearings fail. They all lose their grease over time (and engine cycles IMHO). Getting it replaced *might* not be or even *probably is not* necessary. Maybe. I bought my Box cheap because of a IMSB failure. I bought a used replacement shaft and have first hand experience with the 03 S bearing. It was in what has been termed the "first" stage of failure. I believe all IMSB are in the "first" stage of failure after the first thermal cycle of the engine. My advice is to replace that sucker ASAP. The only catch is that simply replacing it puts the engine right back where it started. There are vast strings on this board regarding options for other design options. Enter at your own risk. Oh yeah, you might want to start a collection from the folks who sing "don't worry, be happy" to fund your complete engine replacement. There is an 8% chance (likely higher due to lack of reporting) that an M96 engine will pop due to the IMSB. Don't be a statistic, replace it with a new bearing at a minimum, and pick a redesign after that to minimize risk. I'm down my own path on this and I think I've identified and eliminate the root cause of early failure. like all mechanical components, the IMSB will eventually fail, but I believe I have a method to stave that off using the original greased sealed bearing.
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