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Are you saying there was no oil change between 24k miles and 36k miles or 24k miles and 46k miles?
Synthetic oils can provide protection and last > 10k-15k miles. BMW free-maintenance OCI is at least 10k miles which means it can still go well past 10k without issue. If the oil had significant breakdown by 10k then they’d be charging the oil much sooner. For street driven miles, I go 8k miles before changing the oil and the Blackstone report shows the oil has not lost any of its protection abilities so the oil could be used for an even longer mile interval for the OCI. Your engine is fine. However, one thing you don’t know is how the car was driven before being fully warmed up. Most engine damage is done during a cold start and the warm up period. You could use a borescope to look inside the cylinders to see if there’s any piston scoring but it’ll probably look fine. Do you have to add any oil between oil changes? If yes, how much over what mileage? Things you can’t see are rod and main bearings but fortunately the b58 doesn’t have a rod bearing issue like the s65 NA 4.0 L V8.
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