I think the mains just wear less, it's a much bigger bearing that isn't moving. The expectation for bearings like these, rod or main, should be "almost-no wear" according to the same people who seem to know things, so getting to the detection threshold for the machine with metal shed from the mains is probably just a lot less likely at the OCI's we're using
WE'll see if there's lead on my next change, I'm going to run one again at 116k
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