I just did the 30k service and my mechanic recommended these plugs. They are expensive, but worth it.
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 use Champion in my 02. Never had any issues.
Learned 40 years ago to use NGK. Installed brand new Autolite plugs in my girlfriends Grand Prix and it ran like crap. Went to a speed shop and they sold me a set of NGK. Ran perfectly. Have only bought NGK or Denso since.
I’ve been running champion plugs for about 40k mi without issue.
I used these in my '19 with no issues.
I do NGK 6510 one step colder. I do 0.025”-0.026” gap. I had a shop do my last set since I didn’t trust myself. He accidentally did 0.022” and I put them in and they’ve been fine. The other set is 0.018” and idk if ima put them in. Gotta change the one step colder NGK’s at around 15-20k miles. I usually change mine when I start seeing high spark retard. I’m BT 93/E40 with aux.
I learned that proper, very hard to tell, NGK knock offs even existed after I was bitten by fake ones off Amazon. The porcelain around the center electrode broke off and went through the engine.
I have installed brand new NGK sparkplugs and Bosh ignition coils...but the cylinder 1 misfire does not move or is resolved at all.
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