Denso FK16HQR11 Iridium Long Life Spark Review

These spark plugs are a complete waste of money. Based on my observations they failed to last even half as long as the previous spark plugs in my automotive.while they may claim to be long-lasting, I didn't even get a year's worth of use out of them before they started causing issues. The one positive is that they did seem to slightly improve my car's performance for the first few months. However, the cons far outweigh any benefits. Avoid these spark plugs at all costs!

Denso FK16HQR11 looks worn at 62K. It's ok but they were on our used Sonata and I think they were under 20k because the peaks were perfect and measured around 0.040. I'm afraid of burn marks on the insulator and burn blisters. I try to attach pictures. One candle was ok, 2 burned out, one burned poorly and bubbled.[,,,]