I have a 2011 Chevy Cruze ECO m6 that I found with motor oil all over the top of the intake manifold and a huge drop in gas mileage (46mpg to 39.1 same consistant driving). It has been to the dealer 3 times so far:
The dealer replaced the timing cover. No change.
The dealer replaced the intake manifold and says that the oil is overpressuring coming the through the PCV from the a valve overpressurizing the system.
The dealer says they need to replace the turbo since the turbo is cooled by engine oil and turbo could be over pressurizing the system but they are awaiting for a final word from the GM engineers...
Now a total time of 3 weeks without the Cruze and I might be thinking a Lemon.
This is now where I am stuck.... Tell me what you guys think.