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That's not the oil filler cap from the factory. Mine states "Engine Oil SAE 5W-30". Looking at the owner's manual now under What Kind of Oil to Use, "Oils recommended for your vehicle can be identified by looking for the "Starburst" symbol. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). Do not use any oil which does not carry this Starburst symbol."
Then it goes on to state to use the proper viscosity oil for your vehicle. NOWHERE in the owners manual or under the hood is the word "synthetic", nor does anything state that "synthetic oil" is required or recommended. If GM tells me to use synthetic in their motors, I would. But on my car, it isn't necessary especially with frequent oil changes as I've always done.
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