Thank you for viewing. NGK Iridium MAX set of 3 LMAR7AIX-P (94981) Used in my car. How about it for those who want to try replacing the plugs while keeping costs down? Registered November 2017 DAA-MM42S Flair Wagon Custom Style XT (Turbo) Used for just under 40,000 kilometers. There were no particular problems, but these are the ones I removed when I replaced the plugs for the second time. They were quite clean, so I removed the dirt with engine conditioner, then washed them with kerosene and an ultrasonic cleaner. I haven't dropped the plugs, but I haven't measured the plug gap.