It is not normal for that engine to use that much oil. i know of another grand prix like yours that lost the engine and the dealer had to replace it. something is wrong with that engine. maybe talk to another gm dealer. good luck
A quart of oil every 1000 is quite excessive. Any external leaks visible? I have an 06 that only uses about 1/16th of quart in 3000 miles. The carbon type rings at the exhaust you describe are normal but the oil consumption is not. Would have this checked for leaks.
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