[chaimav]

It seems that some Traverse vehicles had contaminated oil. Have they done an oil change?

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[chaimav]

The P0300 is for a Random Misfire which is any or all cylinders randomly misfiring, not one specific cylinder. That is causing the P050D code for a rough idle. It could be fuel injectors, bad gas, fuel pressure low or a software issue. You have a first year design 4 cylinder turbo charged engine with Active Fuel Management (AFM). If GM has a bulletin number on this particular problem, then you are not the only one experiencing it.

The bulletin was very generic, just that an oil change is required. It didn't give any mileage constraints which leads me to believe that some contamination got into the oil during production. It is pure speculation on my part that this is causing the issue the OP is having.