i know the recommended plug is the ac delco platinum. in my search i found the ac delco platinum and then i found the ac delco professional platinum. same number on both. is there a difference? and which one should i use for my 2002 sts? thanks for the help

 

Same part number equals same part, warranty should be the same. I would go with best price

 

I put new plugs on my 97 sts tonight ... They were ac delco and really cheap and my car is running so much better and improved gas mileage. The part # for the ones i got is R42LTS