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Discussion Starter #1
I am trying to see what is the best spark plug to use in my 2008 Nitro STX 3.7
I was told on another forum is to use cheap plugs copper and change them every 30,000 miles.

That the 3.7 won't run on anything else.
 

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Khaki Nitro Nut
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29,467 Posts
Another forum? How dare you! LOL
Only use ZFR6F-11G plugs for the 3.7, changed every 30k miles, NGK is OEM brand and what I use.
Do NOT use platinum or iridium plugs in the 3.7! They will only cause problems.
Way back when, one of our members had a relative that did the R&D for the Dodge Nitro and the 3.7 spark plugs. This plug was determined the best, and is what the ignition system was built for.
 

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Khaki Nitro Nut
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29,467 Posts
You're welcome.
 
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