Dinan Heat Range 12 Iridium Spark Plug - BMW B48 TU / B58 TU1 - Single

Dinan specifies this plug a step colder than the factory part so it resists preignition under the cylinder pressure a tuned B48 TU or B58 TU1 sees. The iridium center electrode sits on a copper core, which sheds heat faster and needs less voltage to fire than a standard plug while resisting erosion at the tip. It uses a 12 mm thread with a 26.5 mm reach, a 14 mm bi-hex hex and a flat seat, and arrives gapped at 0.5 mm. Sold as a single plug, so order one per cylinder.

Specifications

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy