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What bearings have you got? And have those bearings been running 5/40 since new? If not you'll have no idea whether that oil has had any bearing (no pun intended!) on their condition.
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Replaced all my bearings over 5 years ago with the bmw ones and have been running 5w40 since.
Interesting to see Hondas F20 is running on 5w30 without bearings issue and S65 10w60 with bearing problems. Them having the same clearances makes me curious about mine in the 5w40