What are the best spark plugs all around?
Don't wanna spend a fortune but want the best for my money. I have a 4.9l inline six ford and I'm putting all new ignition system so I might as well change spark plugs while I'm at.
For your Ford, Motorcraft.
The difference between the best and worst plug is negligible at best - longevity being the biggest factor. Use what the vehicle manufacturer recommends and you can't go wrong. Move to iridium or platinum for longer life if they don't spec those but after that - very little to no advantage based on sparkplug brand or type.
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