Spark plug mystery

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Author Message   Justin Day (Polytropoi61) Member Username: Polytropoi61 Post Number: 46 Registered: 08-2002 Posted on Tuesday, April 29, 2003 - 02:48 pm:    Allright...just so I know that I'm a lock for the "dumbest question" award.... how long (on average) are spark plugs supposed to last? Hard driving...playing in the mud sometimes...towing...etc. just curious.   J E Robison Service Co (Robisonservice) Member Username: Robisonservice Post Number: 92 Registered: 10-2002 Posted on Wednesday, April 30, 2003 - 07:21 am:    Champion rn12 plugs were traditionally changed every 15,000 miles in Jaguar, MG, Rover, Rolls Royce and other British vehicles. Land Rover stretched that to 30,000 but nothing happened to make the plug more durable, they just decided to run it longer. For best performance use the 15k interval.