The fact alone those part numbers were changed is interesting but doesn't necessarily mean there was serious issue. It could be a lot of things. At this point it's worth just keeping an eye out for reports of engine failures. The good news being that the BMW techs I've talked to have seen very few instances of S65 (or S85) failures, as in next to none. Back when the E46 M3 bearing issue was going on there were failures all over the place.
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