Gah, Fram is worst for GM vehicles...everyone should know that. Use AC delco for oil filters. Alvin Champion lol.
Switching to full synthetic is not a bad idea for a car thats used to regular 5w-30, but never go back and forth, that will cause bearing issues in the future. Nissan and Infiniti cars equipped with the VQ37HR engine block use Ethos oil to prevent corrosion buildup on the intake cam for the VVEL system (intake Cam if you want to call it a cam, its really a solenoid idea from Indy cars). I used approved Dexos synthetic blend oils ATM and never ran accross any issues with AC delco filters.
Questionable about the K&N one out there..dunno what their micron rating is, but you need a good micron rating for filteration.
2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille