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Not familiar with n55 engines but isn't that your head gasket?
If that is leaking oil you're in a world of problems.
But I suspect it's just looking there from somewhere else like the ofhg from residue after you fitted the gasket or maybe it's still leaking?
Clean it up with brake cleaner and monitor.
I recently did my gaskets and have been monitoring carefully after every drive. So far, so good, touch wood
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