Denso 5308 Spark Plug - Exhaust Side

Denso Iridium Power Spark Plug 5308

Denso Iridium Power spark plug 5308 is built for drivers who want precise ignition performance and stable combustion response. It uses a 0.4 mm iridium center electrode, a copper core, and a nickel ground electrode with Tapercut and U-Groove tip design for efficient spark delivery.

The Iridium Power line focuses on compact electrode geometry and OE-style fitment across select BMW, Fiat, Porsche, Audi, Volkswagen, Chevrolet, and GM applications. This makes Denso 5308 a practical choice for performance-focused maintenance on vehicles such as the Fiat 500 and Porsche 911.

Key Features

• Iridium center electrode with 0.4 mm tip for concentrated spark energy
• Tapercut and U-Groove ground electrode design
• Copper core center electrode for thermal conductivity
• Nickel ground electrode core material
• 5000 resistance specification
• 0.9 pre-gap size
• 12.00 mm thread diameter, 19.00 mm reach, and 16.0 mm hex size
• Flat seat design for listed applications

Product Details

Denso Iridium Power 5308 is an ignition component for secondary ignition systems, engineered around a fine-wire iridium center electrode and a tapered ground profile. The smaller electrode tip helps concentrate the spark, while the U-Groove ground design supports consistent ignition across the listed fitments. This spark plug cross-references DENSO Auto Parts IXU22 and BMW 12 12 9 061 867 for the same application.

Compatible vehicle coverage includes Fits 2017 Fiat 500, N/A; Fits 2012-2016 Fiat 500, N/A; Fits 2016 Porsche 911, N/A; Fits 2011 Porsche 911, N/A; Fits 2004-2005 Porsche 911, N/A; Fits 2013-2015 Chevrolet Spark, N/A; Fits 2006-2009 Audi A3 Quattro, N/A; Fits 2008-2009 Audi TT Quattro, N/A; Fits 2004-2006 Audi TT Quattro, N/A; Fits 2007-2008 Volkswagen Eos, N/A; Fits 2008 Volkswagen R32, N/A; Fits 2004 Volkswagen R32, N/A; Fits 2003-2006 Porsche Cayenne, N/A; Fits 2004-2006 Volkswagen Touareg, N/A; Fits 1991-1993 BMW M5, N/A.

Common Uses

• Restoring weak or inconsistent spark output
• Addressing rough idle caused by worn spark plugs
• Replacing plugs with excessive electrode wear
• Supporting misfire correction during scheduled ignition service
• Maintaining proper combustion in turbo and naturally aspirated engines

Installation Notes

Verify the listed thread diameter, reach, seat type, and pre-gap before installation. Use the vehicle service specification for final gap verification and torque procedure. Inspect ignition coils, boots, and plug wells during replacement to avoid repeat misfire concerns. Confirm the exact application by year, make, and model before ordering Denso 5308.

Quality Assurance

Denso designs the Iridium Power line around fine-wire iridium electrode construction and application-specific fitment data. The part number 5308 is cataloged for the listed BMW, Fiat, Porsche, Audi, Volkswagen, Chevrolet, and GM applications, including select Fiat 500 and Porsche 911 models.