Ford V-10 sparkplugs (SP 479 or AP 103)
I bought a old X with the 6.8 and wondered what's the best sparkplug to run. I seen Motorcraft SP 479 and Autolite AP 103. Any suggestions? I won't change them, I'll let the mechanic I use change t...
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I think when I changed the plugs on our 2004 X the ford dealer told me to use SP479, it was 2 or 3 years ago. I changed them at about 120,000 miles and they all still looked OK.
