NGK 6418 Spark Plug

NGK Iridium IX Spark Plug 6418

NGK Iridium IX Spark Plug 6418 is built for drivers who need precise ignition performance and OE-level fitment across a wide range of import and domestic applications. With an iridium center electrode, copper core, and 5,000 ohm resistance, this plug is engineered for stable spark delivery and consistent combustion.

The Iridium IX line focuses on fine-wire iridium technology for dependable ignition response and long service life. For vehicles such as the Chevrolet Cruze, BMW 3 Series, and Mercedes-Benz S-Class applications listed below, the NGK 6418 is a direct-match spark plug option when the specified gap and heat range are followed.

Key Features

• Iridium center electrode tip material for focused spark delivery
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with taper-cut tip design
• 5/8 hex size, 14 mm thread diameter, and flat seat design
• Pre-gapped at .032 inches; verify vehicle-specific gap before installation
• Manufacturer heat range 6 for listed applications
• Non-removable nut terminal for standard ignition connections

Detailed Product Overview

NGK Part Number 6418, also identified as BKR6EIX, is part of the Iridium IX Spark Plug line. This product line is designed around a fine iridium firing tip and OE-focused construction to support reliable ignition performance in a broad range of vehicles. The plug’s 5000 ohm resistance helps maintain consistent electrical characteristics, while the taper-cut ground electrode supports efficient spark exposure.

Compatible applications include models such as the Chevrolet Cruze, Chevrolet Volt, BMW 330i, and Mercedes-Benz S600, along with many Audi, Volvo, Volkswagen, Porsche, and Mitsubishi platforms listed in the fitment data. This part cross-references DENSO Auto Parts 5304 and Champion Spark Plug 9001 for the same application.

Common Issues This Spark Plug Addresses

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition output
• Misfire conditions related to excessive electrode wear
• Reduced throttle response from weak combustion events
• Maintenance intervals affected by degraded plug performance

Installation Notes and Fitment Tips

• Fits 2011-2015 Chevrolet Cruze, N/A
• Fits 2011-2015 Chevrolet Volt, N/A
• Fits 2001-2005 BMW 330i, N/A
• Fits 2016-2017 Mercedes-Benz S600, N/A
• Fits 2004-2009 Audi S4, N/A
• Fits 2001-2009 Volvo S60, N/A

Confirm the specified gap for your exact vehicle before installation; listed applications include gaps such as 0.027, 0.028, 0.030, 0.032, 0.035, 0.036, 0.038, and 0.040 inches depending on the engine and model year. Use the vehicle’s service information to verify heat range, reach, and seat type before replacing plugs. NGK 6418 is a direct-fit spark plug for many applications, but final confirmation should always follow the exact year, make, model, and engine notes shown in the fitment data.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with more than 80 years of automotive experience. The brand’s North American and global manufacturing and distribution network supports consistent product availability and OE-oriented quality standards across its ignition lineup.