So I'm sorry to post again but I am really bad at finding things online apparently... I have reached 30k on my 2016 Passion and I am looking to do the maintenance myself. That being said I am having trouble finding the spark plugs I need to get. So I am looking for some help!
The life expectancy of iridium spark plugs is 40,000 to 45,000 miles. The electrode is made of very hard material, but since it is quite small I suppose they do wear down quicker than you think they would. DCO
There are different duty cycles for iridium plugs. one style has a duty cycle of 30-45k miles, the other has a duty cycle of about 100k miles. The center electrode is larger on the longer duty ones. The smaller electrode ones say they are a performance plug and will give a hotter spark for better economy and easier starting among other claims. I would rather change plugs every 100K miles than more often at 45K. But I do a lot of driving...
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