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Your car is fine and hasn't suffered any harm.. From what I was able to find, the main differences between SM and SL oils are the additives that are in them. SM oils have a better wear rating than the SL oils. Now, you said your car has 4,000 miles.. The first oil change was made at 2,500 miles? The good thing is that you had the correct oil during the most important period of the engine's life which I would say is in the first 500-1000 miles.
You have 1500 miles on this oil.. Even if you had the cheapest oil out there, I would bet that the oil that is in there has done a good job in lubricating everything as it should. Now that you know it doesn't have the oil that was recommended by GM, change it.
All I am trying to say is that you don't have a thing to worry about. Get an oil change with Mobile 1 as recommended by GM and call it a day.
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