Quote:
Originally Posted by daman
Who told you the ss/sc only needed 87 octane? All the ss and ss/sc owners in my car club all use premium..
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2006 Chevrolet Cobalt 2SS Coupe Specs & Features at Automotive.com
There. Just because people use it doesn't mean it's recommended, they probably just think it makes it run better, and it very well could. But the factory just recommends 87.
As it happens, the factory does recommend premium for the LNF, but also specifically states that it is not required.
Chevrolet | 2008 Cobalt - Vehicle Specs - Fuel Economy & MPG ratings Click on the Engine tab
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2007 Cobalt SS/NA 
Performance:K&N short ram intake, Purple Hornies glasspack, Jet Stage 2
Visual: color match bowties, shorty antenna, blue footwell led's, partial debadge
Coming Soon:Vibrant 4-2-1 Header/DP
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