NGK CR9EK Spark Plug, Stock Number 4548, Copper Core, OEM Equivalent BMW 12127653439

The NGK CR9EK is a standard spark plug built around a solid copper core for strong heat dissipation, reliable conductivity, and a broad heat range. It carries NGK Stock Number 4548 and uses a standard ground electrode configuration with a nickel ground electrode, a copper center electrode core, and a nickel center electrode tip. The plug is treated with corrosion-resistant plating so it installs and removes cleanly without seizing in the cylinder head, and its resistor design (5000 ohm / 5k) helps suppress ignition noise for smoother running.

This is one of NGK's Standard series plugs, the same core plug design NGK has supplied as original equipment for decades, so it is intended as a direct swap for the factory plug in engines that call for the CR9EK specification. The thread size is 14mm x 1.25. Always confirm the correct spark plug specification against your engine's maintenance manual before ordering, since using the wrong plug can reduce performance and fuel economy or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: CR9EK
• Stock Number: 4548
• UPC: 087295145487
• Resistance: 5000 ohm (5k)
• Ground Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Thread Size: 14mm x 1.25
• Weight: 0.15 pounds

Replaces (OEM)

• BMW 12127653439
• BMW 12127710636
• Suzuki 948200410000

Frequently Asked Questions

What is the NGK CR9EK spark plug? The NGK CR9EK is a standard spark plug (NGK Stock Number 4548) built with a solid copper core for heat dissipation and conductivity, a nickel ground electrode, and a copper center electrode core with a nickel tip.

What OEM part numbers does the CR9EK cross to? The CR9EK, NGK Stock Number 4548, is an OEM equivalent to BMW 12127653439, BMW 12127710636, and Suzuki 948200410000.

What is the thread size on this spark plug? The NGK CR9EK uses a 14mm x 1.25 thread size.

What is the resistance rating of the CR9EK? This plug has a resistance rating of 5000 ohm (5k), which helps suppress ignition noise for smoother engine operation.

Is the CR9EK a resistor-type spark plug? Yes, the NGK CR9EK carries a 5000 ohm resistance rating, consistent with a resistor-type design.

What materials are used in the CR9EK electrodes? The NGK CR9EK, Stock Number 4548, has a nickel ground electrode, a copper center electrode core, and a nickel center electrode tip.

Does the CR9EK come with any corrosion protection? Yes, the CR9EK is treated with corrosion-resistant plating that makes installation and removal easier and helps prevent seizing in the cylinder head over time.

How much does the NGK CR9EK weigh? The NGK CR9EK spark plug weighs 0.15 pounds.

How many spark plugs come in a package? The NGK CR9EK, Stock Number 4548, is sold as a single spark plug per unit.

Is the CR9EK a genuine NGK plug or an aftermarket copy? The CR9EK is a genuine NGK Standard series spark plug, not an aftermarket copy, and reflects the same core design NGK has supplied as original equipment for years.

How do I know if the CR9EK is the correct plug for my engine? Check your engine's maintenance manual for the specific spark plug it calls for before installing the NGK CR9EK (Stock Number 4548), since using an incorrect plug can reduce performance and fuel economy or damage the engine.

What ground electrode configuration does the CR9EK use? The NGK CR9EK uses a standard ground electrode configuration.