NGK Spark Plug BPM8Y (5574) 10-Pack — Standard 98% Copper Core, Corrosion-Resistant Plating

NGK 5574 (BPM8Y) is a reliable standard spark plug built with a 98% copper core, corrosion-resistant plating, and a ceramic insulator for consistent starts and long service life.

These NGK standard spark plugs are engineered for dependable ignition performance across a wide range of gasoline engines. They combine a high-purity copper core for effective heat transfer with durable materials and manufacturing features that simplify installation and reduce the chance of mechanical damage. Supplied as a 10-pack, they’re suited for fleet maintenance, multi-cylinder rebuilds, or keeping a spare set in the garage.

How does this spark plug improve starting and heat control?

The 98% pure copper core increases thermal conductivity, helping the plug shed excess heat and maintain a stable operating temperature. Stable heat transfer reduces pre-ignition and makes starting more consistent, especially in engines that demand reliable ignition under varied conditions.

• 98% copper core for faster heat dissipation
• Designed to lower the risk of overheating and misfires
• Optimized for steady ignition across normal operating ranges

Will these plugs be easy to install and remove?

Yes — the plugs use cold-rolled threads to minimize cross-threading and protect cylinder head threads during installation. In addition, trivalent corrosion-resistant plating eliminates the need for aftermarket anti-seize compounds, making future removal cleaner and reducing the chance of thread damage.

• Cold-rolled threads prevent cross-threading and galling
• Trivalent plating reduces corrosion and removes anti-seize need
• Corrugated ribs on the insulator reduce flashover risk

What construction features ensure durability?

These plugs combine a high-grade alumina silicate ceramic insulator with precision metal plating and a copper core to withstand thermal cycling and mechanical stresses. The ceramic insulator offers high strength and effective heat transfer, while corrugated ribs and robust plating guard against electrical leakage and corrosion.

• High-grade alumina silicate ceramic insulator for strength and heat transfer
• Corrugated ribs to reduce flashover and improve spark reliability
• Corrosion-resistant plating for long-term thread integrity

How many plugs come in the package and what applications suit them?

This listing contains ten NGK 5574 (BPM8Y) standard spark plugs, making it practical for multi-cylinder engines or stocking a supply for maintenance work. They’re intended for typical gasoline engines that specify this plug type and are a cost-effective option for service schedules and general replacements.

• Quantity: 10 spark plugs per package
• Ideal for 4–10 cylinder engine servicing and bulk replacements
• Suitable where NGK BPM8Y is the OE or recommended spec

Who is this for: Automotive technicians, home mechanics, and fleet managers who need a dependable, service-friendly spark plug in bulk. These NGK 5574 (BPM8Y) plugs suit routine maintenance and rebuilds when an OEM-standard, copper-core ignition part is required. They provide a balance of thermal performance, installation durability, and value for non-specialty gasoline engine applications.