[mmorello82]

Piston Slap is a very typical problem with our motors. The piston skirts are just too short. Mine does the same thing. I have tried 5w30, 0w30, and 10w30. All with the same result. What GM told me is, don't worry about it. They said it is just how they are designed. You could go buy a brand new motor, and by 25,000 miles into it, it is going to do the same thing. Thank you GM Design Team. Don't worry about it. Once it warms up, it's all good!