I have a set of ngk tr-55's in my car. There about 5k old. How long did they last in your car. Josh
M MustangLife Active Member Jan 5, 2003 1,285 0 36 Chattanooga, TN Jun 20, 2004 #1 Jun 20, 2004 #1 I have a set of ngk tr-55's in my car. There about 5k old. How long did they last in your car. Josh
