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Spark plugs are a crucial component in the mechanism of the automobiles. For full performance and excitement, your car needs good-quality spark plugs to run the engine. There are a couple of spark plug models in the market. Two of the most popular models are Denso and NGK. Both work well with all types of vehicles. But, which one between Denso vs NGK would you prefer?

Both types are iridium spark plugs. The metal is much less conductive than copper but lasts longer and works at a low temperature. It is also 4-5 times costlier than platinum. Iridium spark plugs are not the best in terms of performance but nothing can beat their longevity. A copper plug lasts for around 20,000 miles, but you will be surprised that the average lifespan of an iridium plug is 40,000 – 60,000 miles. They are also a better option than platinum plugs in terms of consistency and longevity. Unlike the platinum models, they are stable, don’t grow a gap over time, and don’t create extra stress on the ignition system. They also need less maintenance as checking their condition at every 3 to 6 months is enough.


I have noted that NGK Iridium IX does not last longer as compared to Denso Iridium Power. The problem with the NGK’s is that the ground electrode erodes very rapidly compared to the Denso’s (That is, unless NGK has fixed that in recent years).

The varying size of the center electrode has almost no effect on longevity since it’s made of iridium alloy. It’s the ground electrode you need to worry about and I’ve personally noticed the spark from the Iridium IX tip cause severe erosion to the ground electrode (strap electrode), necessitating a re-gap after only five to ten thousand miles. This is probably due to a hotter, more concentrated spark. Denso iridium power, however, do not have this problem.

On the other hand, I just purchased a brand new set of 8 NGK LASER iridium plugs. This is finest plug in the NGK collection and maybe the absolute best plug out there. The NGK laser Iridium is miles ahead of both the Iridium IX and the Denso iridium power. Their Laser Iridium’s do not have issues with the ground electrode, and the whole plug has an advanced design.

Both NGK and Denso now have a twin tip iridium design, which is interesting, but I haven’t seen enough testing or reviews to think that they could be any better than the laser iridium design.

To conclude, having highlighted my experience above, note that both Denso and NGK plugs work well with all types of vehicles – from light cars to heavy-duty pickup trucks. In this choice between Denso vs NGK, you can choose Denso if you care about the horsepower of your vehicle, though it is only a fraction of a percent of the increase of power. NGK should be your choice if you want a stable, long-lasting performance at a lower cost. So the choice is yours!

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By Editor Car Xperts Reloaded

Car Xperts Reloaded is run by highly experienced auto-engineers and auto-bloggers with many years of motor industry workings and passionate about all things related to cars and automotive. Our goal is to provide readers with useful and interesting information, so that they can make informed decisions when purchasing or maintaining their cars. We are open to suggestions and feedback, and excited to be part of the automotive blogging community!

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