technically all ngk, champion, ac delco, autolite... plugs are a copper core...the platinum plugs just have a platinum coating...the advantage of using a platinum plug is better spark over a extended period. copper plugs provide better spark than a platinum intially but over time and use the copper detiorates much faster than the platinum tipped plug....thats the difference between the two...using a standard plug isnt going to hurt anything u just may notice performance decreaser sooner than with a platinum plug