Originally posted by gearhead98:
if they are for the duratec but not the correct ones they are most likely single platinum instead of double platinum, the singles dont last as long as the doubles
That is correct. I took the stock single plats out of my car at 60K miles and the ground electrodes were scalloped badly. They looked like little spoons that were "catching" the spark. The double plats will resist this premature wear & you'll not have to concern yourself with performance robbing plugs for a long time. 
Must be that jumbly-wumbly thing happening again.
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