The proper champion plug is the "QL77JC4" gapped at .030".
I just got a new to me 2016 f150 with 120k. Did air filter, cabin filter, spark plugs (had a misfire) and boots and oil change. I used champion plugs but most reccomend OEM. Got a wix air filter and a fram oil filter. I used full synthetic 5W-20 Valvoline R&P oil. Use rock auto for parts if possible.
I also put Motorcraft new plugs back in. Truck is happy. I'm happy.
Stick with Champion plugs in the 4.0L inline 6. Anything else will have you chasing a “stumbling” idle.
I use champion on my 04. No issues. The more expensive ones that’s when the issues start
I heard from an old ford mechanic once that ford designed their ignition system around the motor craft plugs and no other brand plug will run right if installed. Since then only motorcraft or autolite in my fords.
Champion are the only plugs I’ve had the ceramic crack on, so no more Champion for me.
My service center guys installed Champion plug instead of Bosch on my turbocharged Altroz. Company user manual clearly says to use Bosch in TC. My car's economy has dropped significantly...and I'm just frustrated.
I won't run champion plugs in anything but lawn mowers. That's the only thing I've put them in that didn't get angry about it. Guess everybody's vehicles are different, but personally I don't think they're very good plugs.
That's better than the Motorcraft plugs I received from Rockauto. They were bouncing around (no longer in their original little boxes) in a large shipping box with 2 sets of brake pads.
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