I just replaced all 4 spark plugs on my car @ 114k miles. Now I’m so glad I did it because the car feels way more peppy and responsive.
I got champion copper core for my 5.7 hemi which was what the factory had in it. I changed them at 68k and they probably could have gone another 68k they looked virtually new.Ran like a champ and I got them with rebates and at the end of the day they were 1.00 each.
I upgraded to NGK Iridium spark plug in my classic 500, 2 years ago. There were minor but good changes in performance.
The fuel economy increased a bit and the self starts have been better.
NGK, used them for years in multiple cars. Seem to last longer, but I have no proof.
New NGK plugs this summer and she\u2019s still purring away (and snarling when I drop the hammer). Honestly its one of the best motors ever to come from Honda and I\u2019ve loved both of mine.
Make sure you use genuine NGK plugs, otherwise you will have problems.
I run Champion plugs in my Harleys. I have never had an issue with them and when I did try others, I never noticed any improvement over the Champions.
In a pinch I use champions.
I’m lucky if I get a full 5k miles out of a set of ER10S before one of them shits out and I get a misfire.
I changed my plugs for NGK IRs but now I have a rough idle when the engine warms up.
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