Quote:
Originally Posted by Westersund
And like I linked, the N55 rod bearing clearances are even bigger than the S54 and the recommended oil is even thinner than what I use.
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But the s65 also has that same bearing clearance that the n55 has, and for that BMW recommends 10w60, just as for the s54.
Maybe ideal oil weight is more than just bearing clearance?
Have you done a lot of miles/km in your z4m with the thinner oil? (like 50k km or more?)