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Dexcool unless you flush thoroughly and use the green stuff
I use 10W-30
Mobil 1 5-30 synthetic
Mobile 1 Synthetic 5w30.
Loook in your owners manual, I use syntheric blend 20w50
Use SAE 5w30 Full Synthetic.
If it is for the supercharger, you would use gm supercharger oil. http://www.zzperformance.com/grand_prix/products1.php?id=154&catid=106
Fram Extra Guard PH3387A. ACDelco PF47. Purolator Classic P10111.
More than likely DOT3 but to make sure look on the top of the master cylinder cap. It is always written there.
it shouldn't use any
Use exactly the weight oil as listed in your owner's manual. The brand is your choice an any major brand will be good.
Any major brand 5w20 oil. The filter is just as important as the oil. Use a name brand filter such as AC/Delco, Purolator, & Wix. Click the link to my blog where I discuss changing your oil.