NGKLKAR7AHX-S Spark Plug NGK Ruthenium HX Spark Plug

I recently decided it was time to replace the spark plugs in my 100k Mazda CX-3, and after some browsing on Amazon, I found a set that caught my eye. The price had increased by a dollar since December 2024, but I decided to go for it. After installing them, I immediately noticed a difference. The acceleration was much smoother, and there was a slight boost in power that I hadn’t experienced in a while. As for the fuel efficiency, I haven’t seen a significant improvement just yet, but I’m optimistic about that. Overall, I’m very impressed with the performance of these spark plugs and am really happy with my purchase. I highly recommend them to anyone looking to give their vehicle a little boost!

Top notch quality and performance from a known maker. I've been using NGKs since the '90's.the materials are top shelf. These came pre-gapped (I check them anyway before installing).These went into a '17 Subaru Forester. The job is a major PITA - very time consuming, but the results were worth the effort.I've had spark plugs from other (well know / trusted) makers blow the ceramic insulator out of the metal base before. That was one reason for switching from them to NGKs many years ago. No such issues with these and the engines seem to like these just fine.Definitely recommend these. Great value over the life of the plugs.

These are without a doubt, the best spark plugs that I’ve ever used. I purchased them for my 2016 Honda Civic 2.0 L engine, and they did not disappoint. My car seems to start up quicker and after I install them, I took it out for a test drive, and WOW what a difference in acceleration. This is the best purchase that I did for my car in a very long time. Do not hesitate to buy them.

I'm about 500 miles into these on my 2012 Corolla (inline 4). Seem to work good, engine runs fine and gas mileage is roughly where it was. I don't track it closely enough to tell if there's a tiny increase, but it's certainly not worse. Reasonably priced, consistent gap on all plugs, and easy to install.

The way they cut the tip of the spark plug, you can see that it cut out isn't flat ideally, and it is kind of pointing up upwards(has excess) I am not sure if this will cause any problems later in the long run

The plugs fit my 2015 Honda Accord LX and have been working well for several months. It seems like the idle is a little smoother with these plugs.

50K on the new plugs and they seem to work just fine

Fits 2016 Honda Civic 1.5T and I’m sure this will fit 2.0 Civic as well. After replacing the NGK Iridium, I’ve notice better acceleration, smoother idle and more power with this. Lets see how long will this last. I just put them on yesterday.Update its June 2024It’s June 22,2024 and I’ve had no problems. Highly recommended. My MPG went up as well.Update June June 23, 2025It’s still running fine. Definitely no problems at all. Car still responsive.