I concur with the above, def engine oil. Common failure points are the valve cover gaskets, esp if they have never been changed. The seals become very brittle and fail. Or could but the hoses that go from the OSV to the ridgid oil feeder tube. Those are so close to the engine, well actually run under the intake, so they get hot, melt and fail. if you take the front cowl off, you can get a light back there and see. it will be tight, but should yield enough room to see the hoses.

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2011 E70 50i M Sport