I set the new ngk's i put in to 0.27 and I feel a difference already lot less hesitation off the bottom end felt like it would almost hiccup before gaining any power with the stock plugs. now i lay into it and it just goes fairly smoothly
Forgot to mention that I replaced the RS7 plugs with some APR plugs I had purchased. The gaps of the RS7 plugs were all either out of spec or on the cusp. The APR plugs are another heat range colder than the RS7s
2019 4 gen - dealer sparkplugs were part number ZC20HPR11 > Denso spark plug.
I’m from EU, Scandinavia and that part number were on my original ones I pulled out.
Just installed NGK 92274 in a 2021 Mazda 3. They are 'Ruthenium' instead of iridium, seems to be their newest plug available. Just don't touch the gap, it was perfect at .044. Runs great.
I used Bosch iridium spark plugs in my 2018, no issues
I've had my Bosch platinum spark plugs in for 120k+ kilometers and they still run as good as they did the day I installed them, back in 2011.
I went 134,000 miles on a set of spark plugs on my 11 Ford Fiesta which is, what, a bit around 215,000 km? They were still in decent shape when I pulled them, just a bit out of gap spec, and I was still getting really good fuel mileage.
If you are willing to put some money into it before resorting to drastic measures, try replacing all 6 of your spark plugs and ignition coils. Might help in your case, or it might not.
I'm chasing a cylinder 3 misfire in my S40 right now. I'd put new coils and plugs in two summers ago, but when I pulled that one to check it, the coil came apart and the plug electrode was heavily eroded.
Just another rare earth metal to charge the user more for. Factory specs call for NGK Iridiums. I can't see a reason to deviate.
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