🔥 NGK #6509 Iridium Spark Plug LTR6IX-11 - 6 PCSNEW: Reliable Performance for Optimal Ignition Review

Installed on my 2013 f-150. Worked fine for a day or two and then seemed to have transmission problems. When I finally unplugged it to find the ceramic insulator on the street, it left a crack on both sides. From the very top to the ring in the middle of the plug. It's hard to see, but you can see where it jumped through the black bars.

Bought these for my Cadillac CTS and right after installation I started my car and misfired. I towed my car to a mechanic and they said it was the spark plugs. They put in new spark plugs and my car is fine again. I have contacted the seller and he refuses to return the plugs. What I liked the most is that they deny knowing that Amazon has a tool compatible with cars or that they are buggy. Do not buy from this seller.

: My car has 123,000 miles on it now and it's misfiring and I've had the engine checked from time to time. I removed them and installed AC delco iridium plugs. So hey I have almost 30,000 miles on them but the OEM had 94,000 miles before it needed replacing. So now I choose AC delco. I installed it about 1 month ago. I didn't notice any pep in my car, but no misfires. The original OEM spark plugs on my 2011 Camaro still look good after 94,000 miles, hope they last that long or I'll buy the OEM.

Replaced crappy platinum spark plugs with these iridium spark plugs. LTR6IX-11 have the same temperature range as the original. Ideal for stock or bolt-on vehicles. They are not recommended for forced applications - use the Plug 1 Heat Range cooler for this application. They come with a default spacing of .040" and I left them with that spacing even though the standard spacing spec says .043". The engine runs much quieter up to the red zone, and even small stutters when idling are eliminated…