Thread: Autolite XP Iridium XP5325 Review Spark Plugs
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      12-31-2011, 06:12 PM   #9
RupertPupkin
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Originally Posted by 33beto View Post
NGK website has all the details about heat ranges
Cool thanks. How does that heat range affect it in colder temperatures? Do you think these are not as good as OEM due to the heat range difference?
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