Mistra/Festa/IX25/KX3/K4/Sonata 9 Spark Plug 18849-08080 SILZKR8E8G OEM Replacement

For Nissan Qashqai/JD, Geely? 2000s models such as Matisse? This entry notes Iridium spark plugs 18849-08080 / SILZKR8E8G as OEM replacements for certain post-2000 models including Matic?; However, it lists models Geely Xiang? It states various models including Xsara? Given context, it covers Xian, etc. It claims iridium plugs with improved burn resistance ~3x vs nickel, more stable gap for long high-load operation. OEM numbers 18849-08080 and SILZKR8E8G match OEM ignition parameters; tighten to 26.5 mm thread length; cold engine recommended to protect threads; replacement difficulty moderate.