I think you overfilled it. The PCV system is probably pulling a lot of oil into the intake system and whats not being burnt (does it smoke at all?) is coming out of the exhaust. I don't believe that you've done any damage but, if it were me, I'd want to clean all of that oil out of the intake tract. If you pull the intake tube off of the plenum and it's oily, you'll have your answer.
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