I think he means he thinks the clearances are too tight for a 60. Which isn’t really true in my opinion. If a thinner oil fixed the problem, BMW would have made a change and it would be known by now.Wait. Now it isn’t “enough”?? I thought you said it was the cause of the problem?
All the info anyone could ever want is on this page:
Engine Specs - S65 Rod Bearings - Wiki-DIY
wiki.rcollins.org