Reviews of NGK spark plug

I'm running NGK Iridium NGK LTR71X-II 1 step colder but I am tuned. Been running these sparkplugs since the car had 5000 km. I have 45000 km now in 8 years and a half and I have changed 3 sets as it is recommended to change them a bit sooner than 30000 km on a tuned car.

Ngks are fine but be careful with them. I myself ran these and changed them at 10k intervals. I met someone at a car meet who recommended 5k intervals w these n I didn’t understand till my engine was gone. They can foul up and break inside the cylinder. Granted in my case it was my fault but it’s happened a few times w other ppl.

replace the plugs with NGK only... I did this on 21 cars and every time the car started working as a new one. All cars were Audi of course.

I just got some fakes with the EAC logo on the box and the accurate Japan stamp with the line under the p. I could tell they were fake just by looking at the poorly machined threads, let alone the crooked ground electrode that looks like it is made out of casted tin lol.

I just changed all four NGK platinum spark plugs on my soul. My car’s driving good. No engine skips.

I used NGK laser iridium to replace my probably original 256k mile acdelco plugs. Noticed exactly no difference in performance.

I bought 2 sets of NGK Irridium plugs from Amazon sellers that turned out to be counterfeit. The electrodes were completely worn off with 60k miles on them. They are supposed to last 100,000 miles. The cars were misfiring and had spark knock.

the cheap, no name one it came with was doing the exact same thing as the new NGK one I put in (and properly gapped) to try and remedy the issue.

I bought 4 new NGK plugs (part #92411). Installed them and it ran perfect.

I learned that proper, very hard to tell, NGK knock offs even existed after I was bitten by fake ones off Amazon. The porcelain around the center electrode broke off and went through the engine.