oh, don't let them sell you platinums cause since you have a 6th gen you may have those stock. you want ngk ZFR5-F11s, if it's PZFR5-F11 they are platiums and they'll cost like $10 a piece. the only advantage would be longevity, but with an I4 it's not hard to change the plugs every 20k and copper provides a better spark too.