Denso 5353 Spark Plug

Denso Iridium Power Spark Plug 5353

Denso Iridium Power spark plug 5353 is built for drivers who want precise ignition performance and stable combustion in a wide range of import and luxury applications. Its 0.4 mm iridium center electrode helps support efficient spark delivery, while the tapercut and U-groove ground electrode design is engineered for consistent flame initiation.

The Iridium Power line focuses on compact electrode design and OE-style fitment across many Mercedes-Benz, Mitsubishi, Smart, Chrysler, Dodge, Jeep, Ram, Audi, Kia, and Porsche applications. If you are servicing a Mercedes-Benz C350, E350, or ML350, or replacing plugs in a Mitsubishi Outlander, this part number 5353 is a direct-match option for the listed vehicles.

Key Features

• Iridium center electrode tip for fine-wire spark delivery
• 0.4 mm center electrode design for focused ignition performance
• Tapercut, U-groove ground electrode tip design
• 5000 ohm resistance
• Copper core center electrode with nickel ground electrode core
• Flat seat, 12.00 mm thread diameter, 26.50 mm reach
• Pre-gapped to 0.9 mm
• Compatible with many Mercedes-Benz, Mitsubishi Outlander, and Smart Fortwo applications

Detailed Description

Denso 5353 is an Iridium Power spark plug designed around a small-diameter iridium center electrode to support reliable ignition under demanding operating conditions. The copper-core center electrode helps manage heat transfer, while the nickel ground electrode and standard single-ground configuration provide a conventional service layout. With a 16.0 mm hex size and flat seat design, this plug follows common OE-style service dimensions for the listed applications. This part cross-references Denso Auto Parts IXUH22 for the same application.

Fitment includes 2006-2011 Mercedes-Benz C350, E350, ML350, R350, SLK350, and related models; 2007-2011 Mercedes-Benz CLS550, E550, S550, and GL450; 2013-2016 Mitsubishi Outlander; and 2008-2015 Smart Fortwo. It also covers select Chrysler 200, 300, Town & Country, Dodge Avenger, Charger, Durango, Journey, and Jeep Grand Cherokee applications, along with other listed vehicles. Part number 5353 is a practical choice when replacing worn plugs in Mercedes-Benz C250, GLK350, SLK250, or Mitsubishi Outlander service intervals.

What It Helps Address

• Misfires caused by worn or eroded spark plug electrodes
• Hard starting from weak ignition output
• Rough idle related to inconsistent spark delivery
• Reduced throttle response from degraded plug performance
• Service replacement for OE-style ignition maintenance

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the vehicle service specification before installation. The pre-gap size is 0.9 mm, but final gap verification is recommended during service. Use proper spark plug removal and torque procedures to avoid thread damage in aluminum cylinder heads. Confirm the application by year, make, and model, especially on Mercedes-Benz, Mitsubishi Outlander, and Smart Fortwo vehicles with multiple engine configurations.

Quality Assurance

Denso Iridium Power plugs are built to OE-style dimensional standards and use iridium center electrode technology for precise ignition performance. Part number 5353 is specified for the listed applications and aligns with Denso interchange reference IXUH22.