Quote:
Originally Posted by ryandc
Wasted spark, as others have mentioned.
Because the plug is making the jump one way in one bank and the other way in the other, you will see the cathode wear more in one bank and the anode wear more in the other. This is typical, and you'll typically see this as the tip wearing a lot more in one bank than the other (doesn't impact ignition in a meaningful fashion).
I ran NGK Iridiums for 100,000 miles - put them in at 190 and replaced them at 290. Didn't look factory new, but damn close, and no issues at all.
Platinums will wear 2x as fast, the replacement interval is ideally going to be 25k-50k.
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Very good point!!!!
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