I think he's saying you may have a leak in one of the gaskets or seals.
But that would present its self as a vacuum leak, right ?
205,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here