Denso 5311 Spark Plug

Denso Iridium Power Spark Plug 5311

Denso Iridium Power 5311 is a performance spark plug built for precise ignition response 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 exposure in demanding Audi, Porsche, and Volkswagen applications.

Key Features

• Iridium center electrode with a 0.4 mm tip for focused spark delivery
• Tapercut and U-groove ground electrode design for consistent ignition performance
• 5000 ohm resistor for ignition noise suppression
• Copper core center electrode and nickel ground electrode construction
• Flat seat, 14.0 mm thread diameter, 19.0 mm reach, and 16.0 mm hex size
• Pre-gapped to 0.8 mm
• Manufacturer heat range 24

Product Details

This Denso Iridium Power spark plug is engineered for drivers who want a direct-fit ignition upgrade with OE-style dimensions and performance-focused electrode geometry. The part number 5311 is cross-referenced to DENSO Auto Parts IK24 for the same application. It is listed for select Audi Q7, Audi A6 Quattro, Audi A7 Quattro, Audi A8 Quattro, Audi Q5, Audi S4, Audi S5, Audi SQ5, Porsche Cayenne, Porsche Panamera, and Volkswagen Touareg applications.

The Iridium Power line focuses on compact electrode design and durable materials to help maintain strong spark consistency under heat and load. For fitment-specific searches, this spark plug is commonly referenced for 2018-2022 Audi Q7, 2017-2018 Audi A6 Quattro, and 2011-2015 Volkswagen Touareg applications.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weakened ignition output
• Misfire conditions related to degraded plug performance
• Reduced throttle response from inconsistent combustion
• Ignition noise concerns in electronically sensitive systems

Installation Notes

Verify thread diameter, reach, seat type, and heat range against the vehicle’s service specifications before installation. Check the pre-gap setting and confirm the ignition system is in good condition, especially on turbocharged or higher-output Audi, Porsche, and Volkswagen engines. Use proper torque procedures and inspect coil boots and plug wells during service.

Quality Assurance

Denso manufactures the Iridium Power series with fine-wire iridium technology and application-specific electrode design for consistent ignition performance. Part number 5311 is built to the listed OE-style dimensions and fitment references for the confirmed vehicle applications above.