NGK 7938 Spark Plug

NGK V-Power Spark Plug 7938 Overview

NGK V-Power Spark Plug 7938 is a copper-core, nickel-tipped spark plug built for consistent ignition performance in a wide range of import and domestic applications. With OE-focused construction and a 0.036 in. pre-gap, it is a direct service part for vehicles such as Jaguar XF, Mercedes-Benz E-Class, and Volkswagen EuroVan applications that call for this plug specification.

The V-Power design from NGK is part of the brand’s long-running OE supply lineup, backed by decades of ignition-system manufacturing experience. Part number 7938 is also identified as BKR5E, making it easier to match the correct service replacement when searching by NGK 7938 or BKR5E.

Key Features

• NGK V-Power Spark Plug line for OE-style ignition service
• Copper center electrode core for stable heat transfer
• Nickel center and ground electrode tip materials
• Standard ground electrode design with one ground electrode
• 5000 ohm resistance for ignition system compatibility
• 0.036 in. pre-gap, 14 mm thread diameter, 5/8 in. hex
• Flat seat design with 0.75 in. reach

Detailed Description

NGK 7938 is a V-Power spark plug engineered around a standard electrode layout and OE-equivalent dimensions. The copper core supports efficient thermal control, while the nickel tip materials provide a durable service design for everyday driving conditions. Its 5 heat range, flat seat, and 0.75 in. reach make it a precise match for many vehicles that specify this plug style.

Fitment coverage includes long-tail search applications such as Fits 2007-2009 Jaguar XK, N/A; Fits 2001-2002 Mercedes-Benz C240, N/A; and Fits 1993-2002 Volkswagen Jetta, N/A. This part cross-references Bosch 7927 and Champion Spark Plug 71 for the same application.

What This Spark Plug Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Misfire conditions tied to aged ignition components
• Reduced throttle response from weak combustion events
• Maintenance replacement for OE-style service intervals

Installation Notes and Tips

Verify the vehicle-specific gap before installation, since several listed applications require a different setting than the 0.036 in. pre-gap. Examples include Jaguar XF at 0.040 in., Mercedes-Benz twin-spark applications at 0.044 in. or 0.039 in., and Volkswagen EuroVan at 0.028 in. Use the manufacturer’s service specification for the exact engine code and model year.

Confirm thread diameter, reach, seat type, and terminal style before installation. NGK 7938 is a non-removable nut terminal plug with a 14 mm thread and flat seat, so it should be matched carefully to the cylinder head and ignition lead or coil-on-plug setup.

Quality Assurance

NGK is a major OE spark plug supplier in North America with a long history of manufacturing ignition components for domestic and import vehicles. The brand’s OE legacy and broad vehicle coverage support consistent service replacement quality for applications including Jaguar, Mercedes-Benz, and Volkswagen.