Check this link out to Spark Plugs.com
I was looking at the "Premium Class" Plugs, namely those manufactured by NGK. Among the two available in that class, are the platinums really worth $12 a piece or should I just go with the IX's?
Please note: I have a 2.5L V6 Auto w/o much modding. It has about 64K on it and I am looking to do a complete tune-up.