NGK Racing spark plug - R2525-10 5281 - (BMW M3 / M5 - S54 / S38)

Key Features & Benefits – NGK racing spark plug R2525-10 5281

NGK racing spark plug R2525-10 5281 for race and tuning use with heat range 10. Recommended for Bmw M3 E46 S54 turbo tuned engines above 500 hp and Bmw M5 S38 turbo tuned engines above 500 hp.

The M12 thread and 19.0 mm reach matter when the cylinder head thread depth and chamber geometry need an exact match. A 16 mm hex and the listed 17.0 Nm tightening torque support consistent installation when the thread and seat type match the engine.

When is this useful?

It suits builds where ignition stability and heat management are priorities, and you are selecting heat range to match the engine setup. Correct thread size, reach, and tightening torque are key for fit and sealing.

Technical specs

• Brand: NGK
• Item number: NGK-R2525-10_5281
• Model: R2525-10
• Heat range: 10
• Thread size: M12 mm
• Thread reach: 19.0 mm
• Hex size: 16.0 mm
• Tightening torque: 17.0 Nm
• Recommended quantity: 6
• Weight: 0.04 kg

Selection & installation tips

• Thread & reach: confirm your engine requires M12 thread and 19.0 mm reach.
• Tool access: verify a 16 mm spark plug socket and extension can reach the plug wells.
• Torque: use the listed 17.0 Nm for consistent sealing and thread protection.
• Heat range choice: match heat range 10 to load, fuel, and ignition calibration.
• Quantity planning: pack size is 1 pc; calculate the required quantity by cylinder count and service plan, then compare with the listed recommended quantity: 6.

Before purchase, verify thread size, reach, hex size, and the required heat range for your setup, then compare them to the technical specs listed above.