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This is a known issue with the valve stem seals getting brittle and letting oil leak by. The BMW N63 V8 engines are know for this. It seems to be less common with the N63TU versions.
It may not do anything, but I add some Liqui Moly Oil Saver during my oil changes to help keep the rubber seals from drying out. Worth a shot in my opinion to see if it help at all with lessening the issue.
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