SP580 is the current correct plug for my 2018 3.5. And the NGK should be LTR6BHX, whoops!TVSJR and the Pro's: I have seen SP550 and SP580 listed for the 3.5 EcoBoost. Which is preferred for stock Gen 2 F-150 3.5 Ecoboost (2019) primarily used for towing?
or the LTR6BHK NGK Ruthenium's?
That's what NGK thinks as well...Best question asked so far. I add to it:
Some pretend to be wrench turners think that the new spark plug Nickle plating negates the need for an anti-seize compound. What say our Pro's here?