Dinan Iridium Spark Plug for BMW Gen 3 B58 & Gen 2 B46 B48 Engines

Tuned engines are hard on spark plugs, with higher cylinder pressure leading to spark blowout, preignition and faster wear. Dinan's iridium plug is built for that load, and it works just as well in a stock daily driver. It also needs less voltage to fire a strong, steady spark.

What you get

• Iridium center electrode with a copper core that sheds heat quickly and resists cracking.
• Heat range 12, the same as an NGK 8, so it runs cooler under hard use.
• High melting point. Dinan rates the iridium tip well above silver, platinum and copper.
• Suited to high boost and ethanol setups as well as stock cars.

Good to know

• Made for Gen 3 B58 engines (and Gen 2 B46/B48). Check which engine generation your car has before ordering.
• Sold as a single plug. The B58 uses six.

Brand: Dinan · Part #: D640-0003

• Ships from the brand or distributor, usually in 3–7 business days.
• Shipping is charged at the carrier's rate, shown at checkout. Orders over 70 lb ship by freight for a flat $99.
• Unused parts can be returned within 30 days. Some items are marked no-refund in their description.

Full details are on our shipping and returns page.