Mine is not Strange yours was unless motors was changed I maybe wrong but though it started in 2010 like shown here but really don't know
If you’re thinking about an LS engine swap, LS engine build, or LS engine upgrade, the first place you’ll likely start looking is at the LS motor’s displacement. And that’s …www.onallcylinders.com
Yours probably isn't flex fuel, is it Joe? Yours doesn't have Active Fuel Management? Trust me, that was the original motor. They had an issue with giving a puff of smoke when the other cylinders kicked in. Notorious oil burners from new. Yours probably isn't the aluminum block 5.3?