From: christopher_bender@fmc.com (CHRISTOPHER BENDER) Subject: RE: Spark Plugs Said: >>And when you look tat a Bosch platinum after some miles, its tip becomes >>>rather concave, like the metal of the center electrode is eroded. I >>>thought this was where platinums were supposed to be so great??? Royal says: Open a fresh box...they are DESIGNED with the concave...