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 used the Autolites when I did my plugs at 50k miles. I now have 94k and am going on a 2 week 3500 mile trip. I'll probably go with Motorcraft plugs this time around. I'm also doing all new boots too.
