NGK 2668 Spark Plug

NGK Iridium IX Spark Plug 2668 Overview

NGK Iridium IX Spark Plug 2668 is built for direct-fit ignition service on select Audi, Porsche, and Volkswagen applications. It uses an iridium center electrode, a nickel ground electrode, and a 0.032 in pre-gap to support consistent spark delivery in demanding engine conditions.

As part of the NGK Iridium IX Spark Plug line, this plug is engineered for precise ignition performance and OE-style durability. NGK’s long history as an OE supplier and ignition specialist is reflected in the BKR8EIX design, which is used across a wide range of European performance and luxury vehicles.

Key Features

• Iridium center electrode tip for stable spark performance
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with taper cut tip design
• 0.032 in pre-gap for specified applications
• 5000 ohm resistance for ignition system compatibility
• Flat seat, 14 mm thread diameter, 0.75 in reach
• 5/8 hex size with non-removable nut terminal
• NGK part number BKR8EIX, stock number 2668

Detailed Description

NGK 2668, also identified as BKR8EIX, is an iridium spark plug designed for vehicles that call for a 0.032 in gap and a flat-seat plug with a 14 mm thread. The iridium tip helps maintain a consistent firing point, while the copper core supports heat control under normal operating conditions. This combination makes it a practical choice for owners servicing 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.

This part cross-references DENSO Auto Parts 5311 and 5314 for the same application.

Common Issues This Part Can Address

• Misfires caused by worn or eroded spark plug electrodes
• Hard starting from weak or inconsistent ignition spark
• Rough idle related to aged secondary ignition components
• Reduced throttle response from degraded plug performance
• Service intervals reached on select Audi, Porsche, and Volkswagen engines

Installation Notes and Fitment

Fits 2017-2019 Audi Q7, N/A. Fits 2011-2015 Audi Q7, N/A. Fits 2009-2018 Audi A6 Quattro, N/A. Fits 2012-2018 Audi A7 Quattro, N/A. Fits 2013-2018 Audi A8 Quattro, N/A. Fits 2011-2018 Porsche Cayenne, N/A. Fits 2013-2017 Audi Q5, N/A. Fits 2010-2017 Audi S5, N/A. Fits 2014-2017 Audi SQ5, N/A. Fits 2010-2016 Audi S4, N/A. Fits 2012-2016 Porsche Panamera, N/A. Fits 2011-2015 Volkswagen Touareg, N/A.

Verify the specified gap before installation and confirm the engine calls for NGK BKR8EIX / 2668 with a flat seat, 0.75 in reach, and 14 mm thread diameter. Use the vehicle service information for final application confirmation on Audi Q7, Audi A6 Quattro, and Porsche Cayenne models.

Quality Assurance

NGK manufactures spark plugs for OE and aftermarket use with a focus on durability, fit, and operational consistency. The brand’s North American OE supply background and broad vehicle coverage support confidence in the 2668 spark plug for the listed applications.