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We have seen cars with rod bearing failure at your mileage so I would take these reports very seriously. The problem is once the bearings have been damaged, this begets more damage. Changing the oil more frequently will not prevent this from accelerating.I had similar values with my bearings , almost at the failure point. All S54's need there bearings replaced at some point , some at 30,000 miles some at 80,000 depending on use . Just because you are easy on the car doesn't mean the previous owner was. Did they redline it cold frequently, let run low on oil, not change the oil for 15,000 miles? You have objective data that there is elevated bearing wear despite no hard usage pattern. This makes your levels more concerning than someone who tracks their car. If you plan on keeping your car long term its time to change bearings IMHO.
George
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