BMW N20 Double Platinum Spark Plug 12120039664 SILZKBR8D8S High-Efficiency Combustion

BMW N20 series engines (X1, X3, 3 Series and newer) recommended OEM numbers 12120039664/SILZKBR8D8S dual-platinum spark plugs. Provides stable electrical spark at top dead center for efficient combustion. Torque with torque wrench per specification; approximate labor 0.5-1 hour. If idle jitter, weak acceleration, or fault lights appear, indicate electrode wear or heavy carbon buildup; replacement restores power.