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Spark Plug Replacement every 8,000mi
#30
I traded my 98 Expedition 5.4L in 2010 with 170K miles... it had the original plugs and still got the exact same mpg as it did when new!! I had new oem double platinum plugs for it but never felt the need to torture myself to change them since it always ran great.
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RE: Spark Plug Replacement every 8,000mi - by BestStandard_imp - 10-08-2016, 12:25 PM
51,000 mi. on Original Plugs - by Haystack_imp - 10-12-2016, 12:04 AM

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