Dinan 2025+ BMW Gen2 B48/Gen3 B58 Iridium Spark Plug - Heat Range 9 - 12mm x 26.5mm x 14mm - SINGLE

Dinan Iridium Spark Plugs are an excellent upgrade for tuned, and even stock engines. 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. B48 TU B58 TU1 (Gen 2 B48 Gen 3 B58) 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.

• 152% higher melting point than silver, 125% higher than copper, and 38% higher than platinum
• Acceptable for high performance / tuned and stock vehicle applications alike
• Optimized electrode design for hard to ignite fuels, such as ethanol
• Cooler operating temperature than stock plugs
• Resists preignition better than stock plugs
• Heat range 12 spark plug (Similar: NGK 8)
• Stronger than copper and platinum
• Lower required supplied voltage
• Insulator Material: Ceramic
• Projected insulator design
• Install Torque: 15 + 25 Nm
• Thread diameter: 12mm
• Thread reach: 26.5mm
• Hexagon: 14mm Bi-Hex
• Supplied Gap: 0.5mm
• Terminal Type: Cup
• Seat Type: Flat
• Made in the EU

Upgrade your 2025 and newer BMW Gen 2 B48 or Gen 3 B58 engine with the Dinan DNN D640-0003 Iridium Spark Plug. Designed for both tuned and stock applications, this performance spark plug uses an iridium electrode and copper core to deliver a strong, consistent spark while requiring less voltage than many conventional plug designs. Iridium provides a higher melting point than silver, copper, and platinum, helping the plug withstand demanding operating conditions and resist melting, cracking, and other common limitations associated with standard spark plugs.
The optimized electrode design supports reliable ignition for hard-to-ignite fuels, including ethanol, while the cooler operating temperature helps reduce the risk of preignition. With a Heat Range 12 rating, comparable to an NGK 8 heat range, the Dinan spark plug is suited to performance-oriented applications without sacrificing compatibility with stock engines. Always verify the correct plug length, gap, and heat range for your specific engine before installation. Installing an incorrect spark plug may result in engine damage.
This single Dinan iridium spark plug features a ceramic insulator, projected insulator design, flat seat, cup-style terminal, and 14mm bi-hex drive. The 12mm thread diameter and 26.5mm thread reach are engineered for the specified BMW applications. The supplied gap is 0.02 inches, and the recommended installation torque is 15 + 25 Nm. Made in the European Union, the DNN D640-0003 combines durable construction and precise ignition performance for BMW enthusiasts seeking dependable service from a high-quality replacement or upgrade spark plug.

Features:

• Iridium electrode with copper core for strong, consistent ignition

• Higher melting point than silver, copper, and platinum for improved durability

• Suitable for tuned, high-performance, and stock vehicle applications

• Optimized electrode design for hard-to-ignite fuels such as ethanol

• Cooler operating temperature than stock spark plugs

• Improved resistance to preignition

• Heat Range 12, comparable to NGK 8

• Lower required supplied voltage

• Ceramic insulator with projected insulator design

• Installation torque: 15 + 25 Nm

• 12mm thread diameter

• 26.5mm thread reach

• 14mm bi-hex drive

• Supplied gap: 0.02 inches

• Cup-style terminal

• Flat seat design

• Made in the European Union