Thread: Has anyone ever used colder plugs with 87 octane gas
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Old 08-06-2010, 04:22 AM
jsap jsap is offline
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Join Date: Nov 2004
Posts: 102
I was somewhat confused why my NGK BCP5ES is running hotter than the old Bosch F8DC4. So I got BCP6ES.

Today, while looking for why I'm getting bad mileage, I came across something I hadn't heard before: E85 gas likes colder plugs, by about 3 steps.

So, with the E10, it might be that we need to go a bit colder. Colder being better then hotter, maybe my choice in going one step colder might be a good thing....
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