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If that were true there wouldn't have been metal shavings in my oil filter after 1,000 miles on the factory fill.

To all the other general questions, though.. Any multi-viscosity oil that is SM rated be it dino or synthetic and no heavier than Xw30 will work just fine in any Cobalt engine.

I did my first change at 1,000 and found 5-6 sizeable metal shavings in the filter. This makes me wonder just how many microscopic shavings were suspended in the oil. Second change came at around 3,500 to German Castrol synthetic 0w30. The car runs like a top and I don't plan the next change 'til 8,000 or later.

 

does the 2.2 really need mobile 1 oil?

 

There are few motors that actually -NEED- synthetic. Good dino oil in the proper viscosity is going to do just as good a job when changed at the proper intervals.

Synthetic just happens to protect better and extend drain intervals even longer. That and it helps me sleep at night.

 

yes, time to waste your money on oil...