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Doubtful the 5w50 was the reason that particular S85 made it to 215k.
There are more than a few S65s on the forum past 200k miles that have run 10w60 the entire time. So even with a small sample size that should debunk the notion it was due to the oil....not to mention it's all we have.
The bearings have a design flaw and changing the oil weight isn't going to help.
A properly designed motor should not have any RB issues. Ferrari has been making 8500rpm motors for multiple model generations and those things aren't throwing rods left and right.
It's still the german lottery out there if you haven't replaced them. Very few reports of aftermarket bearings failing, not counting installation/mechanic errors.
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