NGK 3741 Spark Plug

NGK Laser Platinum Spark Plug 3741

NGK Laser Platinum Spark Plug 3741 is built for drivers who need a direct-fit ignition service part with OE-style construction and consistent firing performance. This spark plug uses a platinum center electrode, nickel ground electrode, and a 0.032 in. pre-gap for applications that call for stable ignition and reliable combustion.

The Laser Platinum line focuses on OE-equivalent fit and durability, making it a practical choice for vehicles such as the Mazda 626, Mazda Millenia, BMW 750iL, BMW 850Ci, BMW 850CSi, BMW 850i, and Saturn Astra where the specified plug design and heat range matter.

Key Features

• NGK Laser Platinum Spark Plug, part number 3741
• Platinum center electrode tip for long-service ignition performance
• Nickel ground electrode with standard tip design and standard configuration
• 0.032 in. pre-gap and 5 k? resistance
• 14 mm thread diameter, 0.75 in. reach, flat seat
• Non-removable nut terminal for common ignition wire and coil connections
• OE-style design for select Mazda, BMW, and Saturn applications

Product Details

NGK part number 3741, also identified as PZFR5F, is a Laser Platinum spark plug engineered around OE specifications. The copper core supports heat transfer, while the platinum tip helps maintain electrode stability over service intervals. With a manufacturer heat range of 5 and a flat seat design, this plug is specified for engines that require precise thread size, reach, and gap control. This part cross-references BBB Industries 3741 for the same application.

What This Spark Plug Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Rough idle from weak ignition output
• Misfire conditions related to excessive electrode wear
• Reduced throttle response from degraded spark delivery
• Service replacement needs on OE-specified ignition systems

Installation Notes and Tips

Verify the required thread diameter, reach, seat type, and pre-gap before installation. For fitment-specific service, this plug is listed for 2000-2002 Mazda 626, 1995-2002 Mazda Millenia, 1988-1996 BMW 750iL, 1993-1997 BMW 850Ci, 1994-1995 BMW 850CSi, 1991-1992 BMW 850i, and 2008-2009 Saturn Astra. Check the engine application notes in the vehicle catalog, and confirm the gap specification before final installation.

Quality Assurance

NGK is a long-standing OE spark plug supplier with North American manufacturing and distribution support. Its product line is built to original equipment standards for durability and operational performance across domestic and import vehicle applications.