NGK 4339 Spark Plug

NGK 4339 Standard Spark Plug Overview

NGK 4339 is a standard spark plug built for consistent ignition performance in select BMW and Lamborghini applications. It uses a copper center electrode core with nickel tip materials, a nickel ground electrode, and a flat seat design for OE-style serviceability.

As part of the NGK Standard Spark Plug line, this plug reflects the brand’s long history as an OE supplier for domestic and import vehicles. The design focuses on dependable ignition, stable electrical resistance, and original-equipment-style fitment for everyday engine service.

Key Features

• Part number 4339, NGK DCPR8E
• Standard spark plug design with a flat seat
• Copper center electrode core material for reliable conductivity
• Nickel center and ground electrode tip materials
• 5000 ohm resistance
• Pre-gapped at .028 inch
• 12 mm thread diameter, .75 inch reach, 5/8 hex size
• Removable nut terminal type
• Manufacturer heat range 8

Detailed Description

NGK 4339 is engineered as a standard replacement spark plug for engines that call for the DCPR8E specification. Its copper core and nickel electrode construction support steady spark delivery, while the flat seat and .75 inch reach help maintain the correct installation profile in the cylinder head. This plug is listed for 2001-2006 BMW M3, 2006-2008 BMW Z4, 2001-2002 BMW Z3, and 1990 Lamborghini Diablo applications, with fitment notes calling for a 0.032 inch gap adjustment on the BMW applications and a 0.028 inch OE-equivalent gap note on the Diablo. For buyers searching for a BMW M3 spark plug or a BMW Z4 ignition service part, NGK 4339 provides a direct OE-style service option.

This part cross-references Standard Ignition 7416 for the same application.

Common Issues This Part Addresses

• Rough idle caused by worn spark plug electrodes
• Hard starting from weak or inconsistent ignition output
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from degraded spark delivery
• Maintenance replacement for scheduled ignition service

Installation Notes and Tips

Verify the engine calls for NGK DCPR8E / 4339 before installation. Check and adjust the gap to the vehicle-specific specification listed in the fitment notes: 0.032 inch for the BMW applications and 0.028 inch for the Lamborghini Diablo note. Use the correct 12 mm spark plug socket and confirm the flat-seat sealing surface is clean before tightening to the manufacturer’s torque specification.

Quality Assurance

NGK is a long-established OE supplier and manufacturer with broad coverage across automotive, motorcycle, marine, and small engine applications. The brand’s manufacturing and distribution network supports consistent product standards for replacement ignition service.

• Fits 2001-2006 BMW M3, N/A
• Fits 2006-2008 BMW Z4, N/A
• Fits 2001-2002 BMW Z3, N/A
• Fits 1990 Lamborghini Diablo, N/A