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Old 12-14-2014, 10:05 AM   #3
j.fro
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Join Date: Feb 2005
Location: Virginia
Posts: 1,369
Garage
I've used the Denso iridium plugs and was not happy with them. After 20k I had to replace one do to the tip being burned so bad I got a misfire CEL. At 30k, I changed them all for Bosch, and two more of the tips were going.
Bosch have always looked good when I changed them, and I wondered if they could have gone a lot longer.
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