To my knowledge NGK do not mention any power of fuel economy gains from their iridium spark plugs but if the assertion from Denso is true ie a smaller electrode leading to a more powerful spark then in theory the NGK should give similar benefits. Having said that, there were no running issues with the NGK I simply swapped then over to try the Denso. One thing I can say about swapping to Denso Iridium from NGK Iridium is that the engine appears to start easier however, this could be down to the NGK having well over 100,000 miles on them.
Is it going to be noticeable in day to day driving? I doubt it. They have marketing material on their website showing Denso iridium spark plugs can improve fuel economy and power. Video can’t be loaded because JavaScript is disabled: NGK Iridium IX vs Denso Iridium Power – What’s the difference? () Iridium Spark Plugs – Power & fuel Economyĭenso claim the small electrode conducts easier leading to a more powerful spark. In any case, in our experience, iridium spark plugs will outlast platinum spark plugs a few times over. Is the difference going to be noticeable? Probably not. In theory, the Denso iridium spark plugs would not last as long because the iridium electrode is not as thick. Given how long the NGK electrodes last you could argue the NGK are over engineered and reducing their diameter would have no effect on their service life. The actual iridium electrode looks like it could last the life of the car.ĭenso Iridium spark plugs use a much thinner electrode than even the NGK. The conductor does display wear and we have had to adjust the plug gap because of this. NGK Iridium spark plugs in our experience last literally years, we have been running as set for well over 100,000 miles with no obvious signs of wear on the electrode. NGK Iridium spark plugs (IX) vs Denso Iridium spark plugs, Which is best? This article compares the basic construction differences, the claimed benefits and the price.
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