Ok, question: Which "2016" do you have? The 2016 Limited, or the "All new" 2016.5? There were two very different Cruzes that carries the 2016 Model Year. That kinda makes a difference. If you have the 2016 Limited, (Gen1), then there's a possibility that you've lost a PCV manifold valve and the crankcase is getting overpressurized. I'd not expect that with a Gen2.