- Aug 30, 2004
ACDelco has three different types of Platinum Spark Plugs. They are: 1) Rapidfire- $4.69 2) Professional Platinum 3) Extended-Life Platinum Autozone has an ACDelco "Platinum" Plug, and they sell it for $5.99. I'm not sure if that's the Professional or Extended Life Platinum, but I'm suspecting that it's the former. It'd be great if someone could explain to me the differences between the three, and which of the three are the best. This is for a '96 Saturn that originally came w/NGK Copper Plugs. Thanks.