Dinan Heat Range 12 Iridium Spark Plug, red retail box
Dinan Heat Range 12 Iridium Spark Plug, single plug, side view
Dinan Heat Range 12 Iridium Spark Plug, single plug, side view, alternate shot
Dinan Heat Range 12 Iridium Spark Plug, single plug, close up, threads
Dinan Heat Range 12 Iridium Spark Plug, white ceramic body, angled view
Dinan Heat Range 12 Iridium Spark Plug, red retail box
Dinan Heat Range 12 Iridium Spark Plug, single plug, side view
Dinan Heat Range 12 Iridium Spark Plug, single plug, side view, alternate shot
Dinan Heat Range 12 Iridium Spark Plug, single plug, close up, threads
Dinan Heat Range 12 Iridium Spark Plug, white ceramic body, angled view

Dinan Iridium Spark Plug for BMW B48 TU / B58 TU1 - Heat Range 12, Flat Seat

Dinan SKU: DNND640-0003
Price
11% OFF
In Stock – Ready to Ship
Make sure this fits your vehicle Select your vehicle to confirm fitment before you order. Check
Shipping calculated at checkout.

Details

BrandDinan
SKUDNND640-0003
GTIN / UPC810215392988
Manufacturer Part NumberD640-0003

Product Information

An iridium spark plug with a copper core for tuned and stock engines alike. Iridium has a far higher melting point than copper or platinum, so the plug runs cooler than stock, resists preignition and fires with less voltage, and the electrode shape helps light hard-to-ignite fuels such as ethanol. It is sold as a single plug, so order one per cylinder and check size, gap and heat range against your engine before fitting.

Specifications

Type Iridium spark plug with copper core, projected ceramic insulator
Heat Range 12 (similar to NGK 8)
Thread 12 mm diameter, 26.5 mm reach, flat seat, 14 mm bi-hex
Gap 0.5 mm as supplied
Connector Cup terminal
Engine BMW B48 TU (Gen 2 B48) and B58 TU1 (Gen 3 B58)
Fitment Notes Fits by engine: 2025 and later BMW with the B48 TU (Gen 2 B48) or B58 TU1 (Gen 3 B58) engine. Replaces BMW 12125A523E0. Check size, gap and heat range before installing; the wrong length plug can damage the engine.
Quantity 1

Is this plug only for tuned engines?

  • No. It suits stock engines as well as tuned ones running higher boost, cylinder pressure and temperature.

Does it work with Dinan ignition coils?

  • Yes. It is made as a match for Dinan ignition coils where they apply to the engine.

Shipping

  • In stock orders typically ship within 1 to 3 business days.
  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • 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 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty
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