Denso(5304) IK20 Iridium Power Spark Plug, (Pack of 1)

This part number (Denso 5304) is the stock replacement (OEM) spark plug for the 2006-2011 Honda Civic DX/LX/EX with the R18 1.8L engine. I bought these to replace the original equipment plugs (same part number) as the car rolled 100,000miles. The old plugs had held up well for the entire 100,000miles and I would assume these will to. Replacement was a breeze and there were no issues upon startup.Great quality product that upholds Denso's reputation for quality and performance. I'd recommend this plug to other 8th Generation Civic owners.

Amazon has the best price on denson plugs . They are expensive but worth it. 2003 volvo s60 is running great. Investment but worth it!!🔧🔧

I replaced the NGK plugs i had previously put in my 1999 infiniti q45t a few months before. While both the ND and NGK are iridium, the NGK's did not seem to have the same "uuumph" as the ND plugs that came in the car. I changed out the NGK's (nice and white) with the ND's and the car runs like the scaled dog i am use to. perhaps the heat range was not correct or its just the ND, as the OEM plug, worked better with the particular ignition system. dont change your plugs on your q45 too often; if you own one you know what i mean. a real PIA. but, it was worth it in this care, and unless i start having oil consumption issues, I dont plan to change the plugs again until 300k. If you are a 1997-2001 Q45 owner, go with the ND OEM's.

I installed these plugs in a 2001 Subaru Legacy 2.0. They are direct replacement plugs, and starting seems easier than before. However, after installing these, I learned about the expected longevity on Denso's website.[...]These plugs, which are "Iridium Power" are only designed to last 15,000-20,000 km. If I would have known that before buying, I would not have bought these, but instead bought "Iridium Tough" which are designed to last 100,000 km because it has a platinum-tipped ground electrode whereas the Iridium Power does not.From Denso's Website:"The ground electrode of the IRIDIUM POWER has a tapered cut and a U-shaped groove on its underside, reducing the quenching effect during flame formation and providing exceptional ignitability.The ground electrode of the IRIDIUM TOUGH has a platinum at the discharge point, suppressing electrode wear at discharge and providing the working life of a platinum plug."I feel like I wasted my time and money because I will have to reinstall new plugs in about one year, but that is my fault for not researching first. 4 stars because the plugs themselves work well, but minus a star because I feel that there should be more readily available information regarding longevity.

After a 160k miles, my Toyota Tundra began to misfire due to cracked over-the-plug ignition coils that needed replacement. So just to be certain to fix the misfiring, I thought it would be best to replace the spark plugs too. I looked around online for iridium spark plugs and found these to be the least expensive anywhere. I have always bought the cheap carbon electrode type before I read up on the Iridium plugs and decided to make the spurge and pay the extra money for this spark plug upgrade. I am so glad I did! After replacing the ignition coils and upgrading the spark plugs to these Iridium plugs, I noticed that not only has the misfiring been cured but I now have even more power and better gas mileage than ever before! I am convinced it is because I upgraded the spark plugs to iridium plugs. Yes, they may be much more expensive than you have spent on spark plugs in the past but I am telling you it is worth it. I will NEVER go back to regular carbon plugs again after experiencing the power increase and mileage gains these Iridium plugs provide. I can't recommend these plugs highly enough to anyone to needs new spark plugs in their Tundra. And when Amazon put these plugs on sale, this was the lowest price I found anywhere else online.In any case, purchasing these OEM over-the-plug ignition coils here SAVED ME A LOT OF MONEY.

I just installed a set of these in my 2001 GL1800. I previously had NGK standard plugs with under 1,000 miles on them and AC Rapidfire plugs with 24,000 miles on them.The AC Rapidfire plugs were my previous favorite, but it seems they are not the same plug anymore, having lost the serrated center electrode. The Rapidfires I had previously installed were the non-serrated type. They still provided faster starts than new NGK plugs, but not the improvement I had witnessed in other engines with the serrated Rapidfires.The IK20s, which, in spite of the title and picture, are Iridium Power plugs, provided about a 1/2 second start time, where new NGKs gave a slightly longer than one second start, and the Rapidfires gave a slightly less than one second start. The engine is running smoother than with the 24,000 mile Rapidfires, but that is no suprise. I can't tell if it is running smoother than with new Rapidfires, as the difference is negligable. That is the extent of my review so far, as I have not yet collected enough data to see if I get a fuel economy change, and the power difference is too negligable for me to tell.The Iridium Power spark plug is good for 30,000 miles as per the Denso FAQ. If a 5% fuel economy gain is achieved, then the plugs will pay for themselves a couple of times in that time.There is also a Denso Iridium Tough plug available, the VK20, which is supposed to give less of the benefits of the Iridium power, but last 60,000 miles while still giving improvements over conventional plugs.

It is beyond frustrating to have wasted 2 days waiting to receive a wrong part. It’s also frustrating that there’s no fitment information included in most of these listings - just Amazon’s green check mark or red x to let you know if it’s compatible. Please update the listing to accurately reflect that this product does not fit a non-s 2009 Mini Cooper.