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I have no problem changing the rod bearings every 100k miles. That can be considered as a maintenance item - more like a timing chain on a regular car that has it
However, BMW is keeping hush hush on everything that is associated with rod bearings - they don't specify any maintenance for it. It seems like it's up to the owner to find out what's cooking under the hood, hence if you show good maintenance practice and proper driving patterns with no mods applied - you should be goodwilled for an engine replacement.
There is a potential poo poo if you are not using 10w-60 oil, that's why I stayed with 10w-60. I don't want to break my head dealing with comparisons for different oils and why one is considered better than the other. If manufacturer had a single approved oil for 7 years - I'm using it.
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