I think that the dealer will tell you to change the oil when the Oil Life Monitor(OLM) tells you to. Years ago I would say do it wherever you are comfortable, like 3000-5000k.
With my 2010, we've always changed it in accordance to the OLM. I felt better about doing so when I switched to Amsoil Synthetic oils. GM stands by their OLM's for properly timed servicing intervals. If you were still skeptical you can always go about 3000 miles and then send the gathered used oil to be tested. As you get the results you can change the oil again and have it tested. Based on the results of the first test, they will tell you if the oil is still decently clean or not. You can adjust the amount of miles you go before change based on previous results. I would speculate that oil in these cars with 3000 miles will show results of decently like new oil. I would also suggest a sooner first oil change just due to the evidence of wear metals. I would recommend changing it at 3000 miles the first time. But that's just my opinion.