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97-03 do I know the Series 3 in the 04+ GTPs can go eitherway. Not sure if the 04+ Impalas and Montes do or not
 

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I think its only the Series III 3.8L's that GM says can use 87. The Chevy's have the Series II motor like the 97-03 GTP's. The 04+ Grand Prix's are the only ones that have the Series III as far as I know. Personally, on ANYTHING with boost (turbo or SC), or high compression, I would use premium all the time.
 
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