I'm guessing they have been in there for 175k? NGK for the win.
I decided to try out NGK Ruthenium, and it runs just as good if not better. Ruthenium is much newer technology and is supposed to be able to ignite a larger range of AFR's leading to better throttle response compared to good old iridium.
I've been running Denso IKH24 for 10k miles, have to swap them often but they've been great so far. Frequent changing will prevent damage to them seeing as they are normal projected grounds, but they are pretty cheap to replace once a year or so.
I run [Denso 5749](https://www.densoproducts.com/denso-5749-ikh01-24-iridium-racing-plug) non projected tip plugs with my FBO IS38 car.
They're 1 step colder, and non projected so the risk of a strap breaking off [\(like this\)](https://i.imgur.com/gdJFaJ4.jpeg) are extremely rare.
Denso or Bosh are the best you can return and get new ones
I use NGK BKR6EKPA and NGK PMR7A for my 147 2.0TS
In my '16 sport I use NGK Iridium IX. I've run these in every Honda I've owned since the 90s.
Year ago I bought 2018 R3 for track, for maintanence purposes ive changed spark plugs then, for CR8E obviously because everywhere in Internet and service manuals it says so. Also i took out of this engine used CR8E so everything was fine. Now, funny thing is Im now in process of rebuilding this engine and after taking off engine head realised that spark plug is too short and i was like wtf?!… So for everyone who has at least 2018 R3, go for LMAR8A-9, too short spark plug will
work obviously, I did 3000kms this year on track, but this may affect performance…
I tried Denso once and didn't have great luck with them.
I bought some NGK from RockAuto and they only lasted me 15k miles. I just ended up buying the FoMoCo ones from the dealer.
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