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It makes sense if the failures are related to a production flaw, but not if they're due to a design flaw.
Hear me out:
If the failed IMS bearings were all from a certain oem supplier, or from a certain set of date codes, then one could have faith in the idea that "if it hasn't failed by xx miles, it won't". We could imagine that, nestled deep in the motor, is an IMS from a different OEM, or a different date code.
If, however, the failures are due to a design flaw, then the number of miles should serve to INCREASE likelihood of failure. (Because, as you say, the longer it's stressed, the more likely to fail)
To be honest, I don't know what to make of "no correlation to mileage", other than the frequency of failures must be so profoundly low as to be too small a sample to track trends.
??
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