Denso 5310 Spark Plug - Intake Side

Denso Iridium Power Spark Plug 5310

Denso Iridium Power 5310 is a performance spark plug built for precise ignition and stable combustion. It uses a 0.4 mm iridium center electrode, a tapered cut ground tip, and a U-groove design to support efficient spark delivery in a wide range of import and domestic applications, including Audi R8, Volkswagen GTI, and Chevrolet Cruze fitments.

Key Features

• Iridium center electrode tip material for durable ignition performance
• World’s smallest 0.4 mm center electrode design for focused spark initiation
• Tapercut and U-groove ground electrode tip design
• Flat seat, 14.0 mm thread diameter, 19.0 mm reach
• 5000 ohm resistance for OE-style ignition system compatibility
• Pre-gapped to 0.8 mm
• Nickel ground electrode core with copper center electrode core
• Manufacturer heat range 22

Product Details

The Denso Iridium Power line is engineered for drivers who want a spark plug with a fine-wire iridium tip and a ground electrode shape that supports consistent flame kernel formation. Part number 5310 is a direct-fit style spark plug for many vehicles that call for this plug specification, including select Audi A4, Audi Q5, Volkswagen Tiguan, Honda Civic, and Nissan Xterra applications. If you are replacing worn plugs on an Audi R8, Volkswagen GTI, or Chevrolet Sonic, this plug follows the same performance-focused Iridium Power design.

This part cross-references DENSO Auto Parts IK22 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Misfire conditions related to weak ignition output
• Rough idle and inconsistent combustion
• Reduced throttle response from degraded plug performance
• Maintenance replacement for high-mileage ignition service

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. This plug uses a 16.0 mm hex and a flat seat, so confirm the cylinder head specification matches the vehicle application. Check the pre-gap against the engine’s service requirements before installing, and inspect ignition coils, boots, and wires for wear at the same time.

Compatible fitment includes 2023-2017 Audi R8, 2018-2019 Chevrolet Sonic, 2017-2019 Chevrolet Trax, 2011-2014 Volkswagen GTI, 2003-2005 Honda Civic, and 2002-2004 Nissan Xterra applications listed in the fitment data.

Quality Assurance

Denso manufactures the Iridium Power series with an iridium center electrode and application-specific electrode geometry for consistent ignition performance. Part number 5310 is built to the published specifications shown here, including resistance, reach, seat type, and heat range.