I have always found that fords love autolite platinum plugs and wells coil packs.
The best gap I have found is 0.045!
AC plugs
The best spark plugs are the original equipment plugs that were installed by the manufacturer at the factory. Sometimes you may need to go to a dealer to get the exact plugs.
perform - They perform well when they need to.performs - He performs well.be + performing - I am performing my best. They are performing their best. She is performing her best
The one it was built with. Champion RC12LC4
For BEST performance you should exactly what came in it and that is AC Delco.
Take your pick as far as name brand but definitely stay with a double platinum plug. They last longer and as difficult as it is to change the plugs in the Expedition you won't want to do it any more than necessary.
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Its best you use the fitted platinum tip ones (no adjustments needed). You can find these at NAPA.
The manufacturer recomends A/C Delco in GM vehicles and Champion in Chrysler products and Autolite in Ford products
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This question will probably eventually have A list of every spark plug ever made, Because Like oil, Its an oppinion based question, There is no real answer for this question. I use AC Delco. in GM motors.