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Old 01-12-2015, 11:07 AM
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GEN 1 4.7 engine 2005 WK spark plug upgrades?

Hi guys,

so im due for a sparkplug change & i wanted to know if any of you guys have used any other brand than the Champion 439 copper's & had any insights to their performance over OEM.

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Old 01-12-2015, 01:36 PM
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Re: GEN 1 4.7 engine 2005 WK spark plug upgrades?

I have a WJ with the 4.7 and have used Bosch and now Denso copper plugs. Didnīt see any differences in performance or mpg between them.
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