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

NGK 5574 (BPM8Y) is a standard replacement spark plug sold in a 10-pack, built with a 98% copper core and corrosion-resistant plating for dependable starts and long-term serviceability.

These NGK Standard Spark Plugs are engineered for everyday ignition reliability across compatible engines. They combine a high-purity copper core for improved heat transfer with robust ceramic insulation and protective plating to simplify installation and reduce maintenance. Designed to resist common issues like cross-threading, flashover and seizing, this 10-pack is ideal for fleet servicing, hobbyists, or routine tune-ups.

How does the NGK 5574 improve engine starting and heat control?

The plug’s 98% copper center enhances thermal conductivity so heat is drawn away from the firing end faster than with lower-grade cores. Better heat dissipation helps maintain consistent spark performance and reduces the risk of the plug running too hot under normal operating conditions.

• 98% pure copper core for superior heat transfer
• Reduces tendency to overheat during normal engine operation
• Consistent spark gap stability for reliable ignition

Will installation be straightforward and safe for my engine?

Yes — the NGK 5574 includes cold-rolled threads to minimize the chance of cross-threading and damage to cylinder head threads during installation. Corrosion-resistant trivalent plating removes the need for anti-seize compounds in most applications, simplifying service and preventing seizure when removal is required.

• Cold-rolled threads to protect cylinder head threads
• Trivalent plating resists corrosion and usually negates anti-seize
• Corrugated ribs on the insulator reduce flashover risk

What materials and construction features boost durability and performance?

The insulator is made from high-grade alumina silicate ceramic, chosen for strength and excellent heat transfer. Corrugated ribs on the ceramic surface help prevent electrical flashovers, while plating and quality cores reduce corrosion and wear, extending service intervals when used in recommended conditions.

• High-grade alumina silicate ceramic insulator for mechanical strength
• Corrugated insulator ribs to prevent flashover
• Corrosion-resistant plating for easier removal later

How many plugs are included and what applications suit a 10-pack?

This product comes as a pack of ten identical NGK BPM8Y (5574) plugs. The quantity suits multi-cylinder engines, routine shop stock, or owners maintaining several small engines, motorcycles, or older vehicles that specify this plug type.

• Quantity: 10 spark plugs per package
• Good for multi-vehicle maintenance or shop inventory
• Fits engines specifying NGK BPM8Y / 5574 compatible part numbers

Who is this for: The NGK 5574 (BPM8Y) 10-pack is aimed at mechanics, fleet operators, small-engine technicians, and DIYers who want a dependable, service-friendly replacement spark plug. If you need reliable heat control, reduced installation issues, and a cost-effective bulk supply for routine maintenance, this NGK set is designed to meet those needs without specialty tips or exotic materials.

Note: Always verify the correct spark plug specification for your engine model in the manufacturer's service manual before installing. Product images shown are representational; check packaging labels for exact part numbers.