your oil filter housing cap tight? how about the oil fill cap? dipstick? Pop that ecotec cover off and take the coil pack off, they could have forgot the oil well gaskets that go in the spark plug holes. take it back to the stealership asap brah.
Degrease the area well with your favorite cleaner. Take baby powder and spread it around the suspect area. Drive normally and check often. Where ever there's a leak, the white powder will start to stain from the oil.