I've seen electrode wear on plugs with only 10,000 miles on them back in the old points ignition days. As a matter of fact, that was when we recommended changing the plugs; at 10,000 mile intervals.

The new ignition systems are all much higher voltage. I really wonder how they are able to get the quoted 100,000 miles out of the plugs?? Even if electrode wear was limited by a short duration spark, I would think that gasoline additive deposits would foul a plug long before 100,000 miles!! I welcome any comments on this subject.

AV8TOR