vs
Spark plug Denso or OEM Mazda
The spark plug on the right is 10000% original because it's still working even though it's over 5 years old and has more than 87,000 km on it. The new ones show a little over 5 kilo-ohms, which matches Denso's specification. The old ones show a bit over 3.5 kilo-ohms due to wear.
Pros: still working after years
Cons: lettering looks different
Mileage: 87000 km
NGK/Denso are good plugs for my car I used IK20 Denso plugs as they are iridium plugs which is what you want as they last much longer and are better quality
Pros: better quality, last longer
Vehicle:
Mazda
Part number: IK20
I've been running Denso Iridium on 7 Saabs for years.. both 9.3 V6 and 9.5 2.3l... never an issue on any after 100s of thousand of miles.
Pros: no issues, long lasting
Vehicle:
Saab
Eqt recommends NGK 4905 or Denso 5749. I personally run the densos and they have been good so far, they spark ????????♂️.
Pros: they spark
Vehicle:
Volkswagen Golf
Part number: 5749
I'd opt for a set of 1 step colder plugs. Ideally non projected tip like [Denso 5749](https://www.fcpeuro.com/products/vw-spark-plug-denso-5749) or [NGK 4905](https://www.fcpeuro.com/products/vw-spark-plug-ngk-r74388). Though these are costly.
Pros: non projected tip
Cons: can be costly
Hondas are notoriously picky about the plugs being Denso.
Pros: plugs being Denso
Cons: picky about plugs
Vehicle:
Honda Accord
I’ve used denso IK20TT in whiteblocks and they work very well, may need to re gap if you have some boost raising shenanigans going on
Pros: work very well
Cons: may need re-gapping
Part number: IK20TT
Denso or ngk. Bosch at worst. I would recommend against the off brand in your photo.
Pros: Denso or NGK
Cons: Bosch at worst
I tried Denso once. I took Denso’s out and replaced them with Denso’s. They ran for 500 miles and quit.
Cons: quit after 500 miles
Mileage: 500 km
Im running denso step 2 cold plugs from bms website and tbh i regret not going with the hks plugs
Cons: regret not going hks
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