Champion 9408 Spark Plug

Champion Iridium Spark Plug 9408

Champion Iridium 9408 is a secondary ignition spark plug built for precise spark delivery and stable combustion. Its fine-wire iridium center electrode and platinum ground electrode are engineered to sharpen spark focus, while the resistor design supports consistent ignition performance in modern engines.

Key Features

• Iridium center electrode tip for focused spark delivery
• Platinum ground electrode core material for durable electrode construction
• J-gap ground electrode tip design
• Pre-gapped at 0.041 in (1.05 mm)
• Resistor type spark plug with a flat seat
• Non-removable nut terminal and 16 mm hex size
• Champion Iridium product line for OE-style ignition service

Detailed Description

Champion 9408 is a Champion Iridium spark plug designed around a fine-wire iridium center electrode and a platinum ground electrode to help maintain a sharp spark focus under demanding operating conditions. The plug type is RER8WYCB4, with a 12 mm thread diameter, flat seat, and manufacturer heat range 8. This configuration supports direct replacement service for a range of Mercedes-Benz, Hyundai, Genesis, and Dodge Sprinter applications that call for the specified plug design and gap.

This part cross-references Autolite XP5702 for the same application. It is also associated with OE and service part references including 68005667AA and 68005667AB.

Vehicle Fitment

• Fits 2017 Genesis G80, N/A — Gap 0.044 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2016 Hyundai Equus, N/A — Gap 0.044 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2012-2016 Hyundai Genesis, N/A — Gap 0.044 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2012-2015 Hyundai Equus, N/A — OE Type; Gap 0.044 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2009-2015 Mercedes-Benz G550, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2010-2013 Mercedes-Benz S400, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2012-2013 Mercedes-Benz SLK250, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2008-2012 Mercedes-Benz C300, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2012 Mercedes-Benz GL450, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2010-2012 Mercedes-Benz GLK350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2012 Mercedes-Benz SL550, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006-2011 Mercedes-Benz C350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2011 Mercedes-Benz CLS550, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006-2011 Mercedes-Benz E350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2011 Mercedes-Benz E550, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2009-2011 Mercedes-Benz ML350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006-2007 Mercedes-Benz ML350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2010-2011 Mercedes-Benz ML450, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2008-2011 Mercedes-Benz ML550, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006-2011 Mercedes-Benz R350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2008-2011 Mercedes-Benz S450, N/A — Gap 0.031 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2011 Mercedes-Benz S550, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2009-2011 Mercedes-Benz SLK300, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2005-2011 Mercedes-Benz SLK350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2010 Mercedes-Benz CL550, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006-2009 Mercedes-Benz C230, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006-2009 Mercedes-Benz CLK350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2009 Mercedes-Benz CLK550, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2008 Dodge Sprinter 2500, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007-2008 Dodge Sprinter 3500, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2008 Mercedes-Benz ML350, N/A — OE Type; Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2008 Mercedes-Benz R550, N/A — Gap 0.040 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006-2008 Mercedes-Benz SLK280, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006-2007 Mercedes-Benz C280, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2007 Mercedes-Benz E280, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium
• Fits 2006 Mercedes-Benz S350, N/A — Gap 0.032 in; Plug Type Number RER8WYPB4; Champion Iridium

Common Uses

• Restoring ignition performance on Mercedes-Benz, Hyundai, Genesis, and Dodge Sprinter engines
• Addressing misfire concerns related to worn or fouled spark plugs
• Replacing plugs with the specified RER8WYCB4 service type
• Supporting smoother idle and more consistent combustion in secondary ignition service
• Maintaining correct spark gap where OE specifications call for this plug design

Installation Notes

Verify the plug type, thread diameter, seat style, and gap specification before installation. Confirm the required gap for the exact vehicle application, since listed fitments include 0.031 in, 0.032 in, 0.040 in, and 0.044 in specifications depending on model and year. Use proper spark plug service procedures and torque to the vehicle manufacturer’s specification.

Quality Assurance

Champion Iridium 9408 uses an iridium center electrode and platinum ground electrode construction for durable ignition service. The Champion Iridium line is built for precise spark focus and OE-style replacement needs across the listed applications.