This engine is one of the new Bosch gasoline direct injection engines. While that improves performance it can aggravate situations like this. In a traditional engine the gas flowed into the cylinders through the intake ports, so it acted as a cleaning solvent to keep the ports clear. Now, with GDI, the gas is fired right into the cylinder and nothing but air enters through the port. If the air is laden with oil mist, this is going to be the result.
I expect this is not the last one of these we'll see