At 85k I swapped to NGK Iridium Ix plugs on my 2019 civic with the 2.0na and I swear it added at least 20% response. Makes me wish I would have gotten it with a manual cause it would be so much more fun to drive around town. Also got a few more MPG
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 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.
DENSO ZXE24HLR7 is also an excellent OE plug.
Denso 3289 is what I run.
398k on the clock, like 50k on these plugs, she runs clean and smooth.
Also I like the NGK sparkplugs more than Bosch.
Had some problems with Bosch plugs once.
I had plugs from Amazon ngk and I had a wicked misfire couple days after. Somehow the ceramic broke off.
Please use original plugs for the replacements. Just yanked out aftermarket NGK platinums because of a misfire. For some reason, Mazda and aftermarket plugs in my experience always resulted in a misfire.
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