[sleeperSS]

those 3.8 supercharged motors take premium?

 

[sleeperSS]

N/M got my answer

 

[GTP231]

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

 

[Reidonly]

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.