I am running platinum Autolite plugs in my 2.3 rwd and don't regret it
NGK iridium for plugs.
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
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.
Have used NGK on every vehicle I've ever owned. They've often lasted the life of the vehicle.
ive put about 15k on a stock gapped set, no issues APR IS20 87 tuned,
You will be fine if you go with them. Like others have said it's a solid plug and no issues so far with mine.
Here’s a link that may be of help. Your plugs are quite fouled and even at end of life plugs should not look like that.
2018 Kia Soul Base, 57k miles, on the third set of plugs and they are misfiring already. Factory plugs lasted 30k miles, followed up with Autolite plugs lasting 10k (which I chalked up to being cheap/low-quality plugs), but now these NGK iridiums are giving out with 17k miles on them.
With almost every car, using OEM plugs is the way to go. The one brand to ALWAYS avoid is Autolite. They are extremely poor quality and I have never seen them work long enough to justify the cost saving.
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