OPELIKA, AL. (May 7th, 2025) - Dinan is pleased to be able to announce an exciting new addition to the ignition category – spark plugs! Compatible with a wide array of both stock and tuned BMW engines such as the N54*, N55*, S55, B58 and S58, among others, they are a perfect complement to Dinan ignition coils. Experience the Dinan difference today and never look back!

Part Number(s): D640-0001 & D640-0002

Application(s):

• Various BMW & MINI turbocharged engines from 2007+ inclusive of the N20, N54*, N55*, S55, N63, N63TU, S63, S63TU, B48, B58 and S58

The Quick and Dirty:

• Heat range 9 spark plug (Similar: Bosch 3, Brisk 10, Champion 4, Denso 27, and NGK 9)
• 152% higher melting point than silver, 125% higher than copper, and 38% higher than platinum
• Stronger than copper and platinum
• Acceptable for high performance / tuned and stock vehicle applications alike (where applicable*)
• Projected insulator design
• Lower required supplied voltage
• Cooler operating temperature than stock plugs
• Optimized electrode design for hard to ignite fuels, such as ethanol
• Resists preignition better than stock plugs
• An excellent match for Dinan ignition coils
• Thread reach: 26.5mm
• Thread diameter: 12mm
• Hexagon: 14mm Bi-Hex
• Seat Type: Flat
• Install Torque: 17 Nm
• Insulator Material: Ceramic
• Supplied Gap: 0.5mm
• Made in the EU

The Story:

Dinan Iridium Spark Plugs are an excellent upgrade for tuned, and even stock engines, where applicable. * Our spark plugs are made from Iridium - one of the strongest materials available. They last longer than other materials with higher melting points, run cooler, resist preignition, and even require less voltage to produce a strong spark. The iridium electrode with its copper core is harder and stronger than other materials, can dissipate heat more easily, and is better protected from melting, cracking, and other limitations found with standard plugs.

Dinan spark plugs are great for high boost, high cylinder pressure, high cylinder temperatures, and high-power situations, and they pair nicely with a set of Dinan ignition coils, where applicable. However, they are not only for tuned and higher output vehicles that may benefit from a plug cooler than the factory heat range – they also are applicable to non-tuned / stock vehicles as well! *

Compatible OEM Part #Cross Reference:

• D640-0002 -- 12120039664, 12120038896, 12120038704
• D640-0001 -- 12120040551, 12122455258, 12120046646, 12125A4EF60

*N54 & N55 COMPATIBILITY: Dinan plugs are numerous steps colder than stock on both the N54 (3 steps colder) and N55 (2 steps colder) and are suggested for tuned, high boost and/or upgraded turbo applications only. They are *NOT* suggested for non-tuned stock vehicles for these specific applications. If installed on a stock N54/N55 vehicle the plug will not reach its self-cleaning temperature and be unable to burn off the combustion deposits leading to fouling, misfires, and a shorter lifespan of the plug.

INSTALLATION NOTE: Always check sizes, gap, and heat range specs before installing. Installation of the wrong length plug can cause damage to the engine. You must verify this before installing the plug.