NGK Iridium Spark Plugs LFR6AIX-11 (4 Pack) - Brand New Review

Car runs great, my friend changed my old spark plugs and the car responds very well. Difficult to compare to other brands but my mechanic recommends this brand.

Worked for 3 months. One of them began to drop out. Upon inspection I found that the white insulation on top had come loose causing a misfire. The guarantee is only valid for 1 month. Luckily I kept the old ones.

My 2004 Mercedes cl55 amg needed new spark plugs because I don't know when the last owner made them. Had to buy 16. Haven't noticed any difference in performance or if the car is smoother but just glad to know the spark plugs are gone and I won't have to bother with them for a while.

The packaging says NGK and I think they are genuine but the logo is not quite centered like the originals. Everything else looked premium and I didn't see any issues other than the placement of the logo. Let's hope they're real and hope they continue to work well.