Re: Best spark plugs for a 4.0 SOHC are...
stick with motorcraft/autolite...fords really dont like anything else
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2021 F150 5.0 Screw
Past:18 F150 2.7, 16 F150 5.0, 14 F150 5.0, 07 F150 5.4, 03 Ranger 4.0
Master Certified Ford Parts / Warranty Admin
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