BMW Iridium Spark Plug 12120038896 SILZKBR8C8S Original Ignition Upgrade

BMW 3/5 Series, X3 and other post-2000 models may use OEM 12120038896/SILZKBR8C8S Iridium spark plugs; direct replacement for factory positions. Iridium electrodes offer longer life and reliable combustion. If cold-start is difficult, acceleration hesitates, or fuel consumption rises, replace to improve power response and idle stability. Aging symptoms include increased ignition gap; timely replacement prevents misfire.