NGK 5881 Standard Spark Plug (BKR7EKU) - Copper Core, 5/8 Inch Hex, Semi-Surface Discharge

The NGK 5881 is a Standard series spark plug built on NGK's proven copper-core design, offering reliable ignition performance and broad heat range for engines that call for the BKR7EKU plug. The center electrode uses a solid copper core for superior heat dissipation and conductivity, paired with a nickel center electrode tip and a nickel ground electrode set up in a semi-surface discharge configuration. A high-grade alumina silicate ceramic insulator provides strength and efficient heat transfer, while corrosion-resistant trivalent plating on the shell means installation and removal do not require anti-seize compound. Cold-rolled threads help prevent cross-threading and damage to the cylinder head during installation. With a 5,000 ohm resistor built in, the NGK 5881 helps suppress ignition noise while maintaining consistent spark delivery. Each package contains one spark plug with a 5/8 inch hex for standard plug sockets and wrenches. Always check your engine and maintenance manual to confirm the NGK 5881 (BKR7EKU) is the correct plug for your engine, and install only as recommended by the engine's original equipment manufacturer, since using the wrong plug can reduce performance, hurt fuel economy, or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 5881
• Product Code: BKR7EKU
• UPC: 087295158814
• Resistance: 5,000 ohms
• Ground Electrode Configuration: Semi-Surface Discharge
• Ground Electrode Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Hex Size: 5/8 inch
• Insulator Material: Ceramic (alumina silicate)
• Core Material: Copper
• Weight: 0.15 pounds
• Quantity: 1 spark plug per package

Replaces (OEM)

• AUDI 101000035AE
• VOLKSWAGEN 101000035AE

Frequently Asked Questions

Is the NGK 5881 the same spark plug as the NGK BKR7EKU? Yes, 5881 and BKR7EKU refer to the same NGK Standard spark plug, with 5881 being the part number and BKR7EKU the plug's product designation.

What hex size does the NGK 5881 spark plug use? The NGK 5881 (BKR7EKU) has a 5/8 inch hex, sized for a standard spark plug socket or wrench.

Does the NGK 5881 have a copper core? Yes, the NGK 5881 uses a solid copper center electrode core for improved heat dissipation and conductivity.

What is the electrical resistance of the NGK 5881 spark plug? The NGK 5881 (BKR7EKU) has a built-in resistor rated at 5,000 ohms, which helps suppress ignition noise.

How many spark plugs are included when I order the NGK 5881? One NGK 5881 (BKR7EKU) spark plug is included per package.

What ground electrode design does the NGK 5881 use? The NGK 5881 uses a semi-surface discharge ground electrode configuration with a nickel ground electrode.

Do I need anti-seize compound to install the NGK 5881 spark plug? No, the NGK 5881's trivalent plating eliminates the need for anti-seize compound during installation.

What is the insulator on the NGK 5881 spark plug made of? The NGK 5881 (BKR7EKU) uses a high-grade alumina silicate ceramic insulator for strength and heat transfer.

How much does the NGK 5881 spark plug weigh? The NGK 5881 spark plug weighs 0.15 pounds.

What UPC is assigned to the NGK 5881 spark plug? The NGK 5881 (BKR7EKU) carries UPC 087295158814.

Are there OEM equivalent part numbers for the NGK 5881? Yes, the NGK 5881 (BKR7EKU) has listed OEM equivalents of AUDI 101000035AE and VOLKSWAGEN 101000035AE.

How do I know if the NGK 5881 is the correct spark plug for my engine? Check your engine and maintenance manual before installing the NGK 5881 (BKR7EKU), since using the wrong plug can reduce performance, lower fuel economy, or damage the engine.