NGK(94124) ILKAR7L11 Laser Iridium Spark Plug (1 Plug)

I bought this spark plug for 2019 Mazda CX5. I read several negative reviews that made me concerned. One reviewer indicated that the spark plug gaps were incorrect. I checked mine and all four were correct. Note that the spark plug for turbo version of Mazda's Skyactiv engine has a differerent gap than the non-turbo engine. I am wondering if some of the reviewers are misapplying the part. There was also a complaint about loss of fuel efficiency after replacing the spark plugs. That is serious becuse the engine is a direct-fuel-injection type and it is prone to carbon buildup if fuel is not fully combusted. I decided to collect my car's baseline mpg data before I replace the spark plugs and compare it to the mpg I will be getting after replacing the spark plugs. It turns out many things affect the mpg. I had to collect average mpg over a minimum of 40 mile trip to get a repeatable and reliable data. Ambient temperature and vehicle speed (mph) also affect the mpg. I collected mpg data on long trips from Dallas to Houston, Texas. The 1st was on Dec 24, which was before replacing the spark plugs. I started with a full gas tank; drove at posted speed limits for 261 miles; and when I arrived in Houston, it took 7.582 gallons of gasoline to fill the tank back to full. That resulted in 34 mpg. I replaced the spark plugs on Dec 31st and made another trip from Dallas to Houston on Jan 7th. This time, the trip consumed 8.497 gallons for a 262 miles trip which resulted in 31.5 mpg. That was a loss of 2.5 mpg with the new plugs. I knew that the ambient temperature was lower for the latest trip compared to my trip in December. I decided to repeat the test again. Today, Feb 4th, I made another trip from Dallas Houston. The ambient temperature was 61deg F when I left Dallas and it had dropped as low as 53 deg F at some point in the trip. It was back to 61 deg F when I arrived in Houston. This time, the trip consumed only 6.786 gallons to travel 265.3 miles; which equals to 39.1 mpg! I am wondering if temperature alone can explain the increased mpg for the latest trip or somewhat the spark plug needed some time to be broken-in before it performed well. I do not know the answer. My conclusion is that my new spark plugs are performing as well or beter than the old spark plugs. Will I buy these spark plugs from Amazon again? Probably not. Yes, the part performed well, but I still don't want take a risk of buying a counterfeit which could damage the engine, just to save something like $20 or $30. Next time, I will buy only from a Mazda dealership or from NGK authorized distributor. AutoZone, Advance Autoparts, O'Riley and NAPA are all authorized NGK spark plugs distributors.

Easy replacement on Mazda 3.

They fit my Mazda perfectly.

This is the second 100K mile time i used these. I am at 200K now. Car runs like new and fully expect to change these with the same at 300k. Exact OEM replacement for the skyactive 4cyl. Edit: Just noticed some other reviews stating made in Taiwan vs Japan. My second set. (this purchase) are Taiwan also. Car still runs great. I dont expect NGK to falter on their QC. Would not have bought them if they were from PRC though.

Decided to replace original spark plugs at 62k miles, sprisingly factory plugs still looked OK, went ahead and put in this set but noticed no improvement in engine response whats worse had a decline in MPG not sure why paid premium for these hence the 4 star rating.Update** took them off literally 9k miles and they are crap. Pictures of the oem (left) vs these gap difference was huge. 1 star.

The box was different than the same plug bought at a local auto parts store. I emailed NGK with photos of one of the plugs including the lot number on the plug and they confirmed the plug was authentic. Ensure when you buy from Amazon that the seller is actually Ama on, not just shipped by Amazon.

Was nervous they were fake because it said Thailand on the plug double checked with NGK they confirmed they are legit saved time and money doing it myself!

Visually looked to be a 1:1 replacement of the old ones. Car seems to run fine but time will tell.