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My wife just acquired a 2011 Fusion SEL 2.5. I've got a 2015 Focus ST. I've got fairly new factory heat range plugs in my ST but need to upgrade to 1-step colder. I've noticed that the factor ST plugs are one heat range colder than the factory Fusion plugs. Can I run 1-step colder plugs in the Fusion?
 

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My wife just acquired a 2011 Fusion SEL 2.5. I've got a 2015 Focus ST. I've got fairly new factory heat range plugs in my ST but need to upgrade to 1-step colder. I've noticed that the factor ST plugs are one heat range colder than the factory Fusion plugs. Can I run 1-step colder plugs in the Fusion?
Hi PS. Well, you "can", but why would you want to? The Fusion is tuned for the recommended plugs. A "colder" plug will give no performance or efficiency improvement and may even be detrimental.

Good luck with whatever you decide to do.
 
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