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Originally Posted by 2007 ion2
0w30 improves cold weather starts, but I don't live in the cold anymore. I do run full synthetic oil and transmission fluid, though
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No, the original 5w-30 crankcase oil is fine for cold weather "starts". Mobil 0W-30 is specified for low friction and high efficiency.
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Mobil 1 0W-30 Advanced Fuel Economy is engineered to deliver outstanding engine protection and to offer improved fuel economy in vehicles where SAE 0W-30, 5W-30 or 10W-30 oil is recommended. This low friction, fully synthetic formulation increases engine efficiency and offers outstanding fuel economy. Over the life of your vehicle, Mobil 1 Advanced Fuel Economy can save over $400 in fuel costs.
Mobil 1 0W-30 Advanced Fuel Economy
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$25/5 quarts at Sprawl*Mart. That is as cheap as any other synthetic oil, so there is no reason not to use it. (Except if you don't want to change the oil yourself. Good luck finding a shop that will provide 0W-30 for your car.)
Check your owner's manual to see if this is the oil specification: GM 6094M