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Iridium will fire under more extreme conditions than other plugs, they came out of top fuel racing and onto the street for a reason.


Never assume any gap is correct. There are, however, spark plugs which you cannot (and should not attempt to) gap, such as Bosch Platinum +4. You should always check the gap to ensure it is correct on new spark plugs no matter where you get them from.


I had the same thing just happen to my car. Cylinder #1 was running to lean for a little but. Then idleing she began to bog out. Removed #1 and #3 plug, both ends were melted, removed as much carbon build up and cleaned out plug hole. Was told due to low octane gas, this can happen and it happens often. I drive a 2007 Subaru Impreza 2.5i. I replaced all four ...

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