Performance wise there should not be much difference but where replacement time frame is concerned, you are talking at about 4 to 4 times in between each iridium spark plugs replacement.
Normal spark plugs should last you 12 to 15 k miles wheareas the iridium would last up to 60 k miles. Of course figures are subjective as they are also governed by conditions such as engine condition and driving.
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Tuesday, May 14th, 2013 AT 5:36 PM