NGK SILZKBR8D8S spark plug (BMW, NGK 97506)

NGK 97506 SILZKBR8D8S Spark Plug

The NGK SILZKBR8D8S (Part No. 97506) is a high-performance spark plug, commonly used as an upgraded option for BMW N54, N55, and S55 engines. With a slightly colder heat range than stock, it’s ideal for tuned or high-boost applications where better combustion stability and knock resistance are essential.

This spark plug features laser-welded fine iridium and platinum tips to ensure durability, consistent spark, and improved throttle response under demanding conditions.

• Thread size: M12 x 1.25
• Heat range: 8 (colder than stock)
• Laser-welded iridium center electrode
• Platinum ground electrode for extended life
• Gap: typically set to 0.022–0.025″ (0.55–0.63 mm)
• OEM-grade performance and reliability

Perfect match also with upgraded coilpacks such as B58 ignition coils in BMW N54/N55/S55 coil conversion kits.