Denso 3457 Spark Plug

Denso Iridium Long Life Spark Plug 3457

Denso 3457 is an Iridium Long Life spark plug built for OE-level ignition performance, durability, and emissions control. It uses an iridium center electrode with a platinum needle ground tip to support stable spark delivery in demanding street and performance applications.

The Iridium Long Life (SIP) line focuses on extended service life and consistent ignition characteristics for vehicles that call for a fine-wire plug. This plug is a direct-fit option for select Nissan, INFINITI, Subaru, and Mercedes-Benz applications, including Nissan GT-R, Nissan 370Z, INFINITI Q50, and Subaru WRX fitments.

Key Features

• Iridium center electrode tip for precise spark delivery
• Platinum needle ground electrode tip with needle-to-needle configuration
• 5000 ohm resistor design for ignition system noise control
• Copper core center electrode and nickel ground electrode core
• Pre-gapped to 1.1 mm for OE-style installation
• 12.00 mm thread diameter, 26.50 mm reach, and flat seat design
• Manufactured to meet strict OE performance, durability, and emissions standards

Product Details

Denso 3457 is engineered as an OE-style secondary ignition component for engines that require a fine-wire iridium plug with a flat seat and 14.3 mm hex. The Iridium Long Life construction helps maintain consistent ignition performance over extended service intervals, while the platinum needle ground design supports reliable spark exposure under heat and load. This part number is commonly searched for Nissan GT-R spark plug replacement, Nissan 370Z ignition service, INFINITI Q50 tune-up parts, and Subaru WRX spark plug applications.

This part cross-references DENSO Auto Parts FXE24HR11 and Subaru 22401 AA830 for the same application.

What It Helps Address

• Rough idle caused by worn spark plug electrodes
• Hard starting from weakened ignition output
• Misfire conditions related to plug wear or gap growth
• Reduced throttle response from inconsistent spark delivery
• Service intervals that require an OE-style long-life spark plug

Installation Notes and Tips

Verify the vehicle’s engine code and OE plug specification before installation. Confirm the 1.1 mm pre-gap, thread diameter, reach, seat type, and heat range match the original application. Use proper spark plug removal and torque procedures to avoid thread damage in aluminum cylinder heads. For best results, inspect ignition coils, boots, and plug wells during service, especially on higher-mileage Nissan, INFINITI, and Subaru engines.

• Fits 2023 INFINITI Q50, N/A
• Fits 2023 Nissan GT-R, N/A
• Fits 2023 Nissan Z, N/A
• Fits 2017-2022 INFINITI Q50, N/A
• Fits 2017-2022 INFINITI Q60, N/A
• Fits 2017-2021 Nissan GT-R, N/A
• Fits 2017-2021 Subaru WRX, N/A
• Fits 2017-2020 Nissan 370Z, N/A
• Fits 2017-2019 INFINITI Q70, N/A
• Fits 2017-2019 INFINITI Q70L, N/A
• Fits 2018 Subaru Forester, N/A
• Fits 2017 INFINITI QX50, N/A
• Fits 2017 INFINITI QX70, N/A
• Fits 2014-2017 Subaru Forester, N/A
• Fits 2014-2016 INFINITI Q70, N/A
• Fits 2015-2016 INFINITI Q70L, N/A
• Fits 2014-2016 INFINITI QX50, N/A
• Fits 2014-2016 INFINITI QX70, N/A
• Fits 2009-2016 Nissan 370Z, N/A
• Fits 2009-2016 Nissan GT-R, N/A
• Fits 2015-2016 Subaru WRX, N/A
• Fits 2015 INFINITI Q40, N/A
• Fits 2014-2015 INFINITI Q50, N/A
• Fits 2014-2015 INFINITI Q60, N/A
• Fits 2011-2015 Mercedes-Benz SLS AMG, N/A
• Fits 2013 INFINITI EX37, N/A
• Fits 2013 INFINITI FX37, N/A
• Fits 2008-2013 INFINITI G37, N/A
• Fits 2011-2013 INFINITI M37, N/A

Quality Assurance

Denso manufactures this spark plug to strict OE performance, durability, and emissions standards. Part number 3457 is built for consistent fitment and ignition behavior in the listed applications, including Nissan GT-R, Nissan 370Z, INFINITI Q50, and Subaru WRX models.