NGK 5476 Spark Plug

NGK Laser Iridium Spark Plug 5476

NGK Laser Iridium Spark Plug 5476 is an OE-style ignition component built for precise fitment and stable combustion performance. It uses an iridium center electrode tip, a nickel ground electrode, and a tapered seat to match the factory-style requirements listed for a wide range of GM and Saab applications.

The Laser Iridium line focuses on OE replacement accuracy and long service life. For drivers servicing a Chevrolet Camaro, Cadillac CTS, or Buick Regal, this spark plug is specified with the correct heat range, pre-gap, and terminal style for the listed applications.

Key Features

• Laser iridium center electrode tip for consistent spark delivery
• Nickel ground electrode with standard ground configuration
• Pre-gap size: .036 in. for listed applications
• Tapered seat design
• 5 k? resistance for ignition system compatibility
• Copper center electrode core for thermal conductivity
• Non-removable nut terminal type
• Hex size: 5/8 in.; thread diameter: 14 mm; reach: 25 mm

Product Details

NGK part number 5476, also identified as ILTR5D, is engineered as a direct replacement spark plug for vehicles that call for a laser iridium design. The construction supports reliable ignition performance across the listed fitments, including 2015-2019 Chevrolet Corvette, 2016-2019 Cadillac CTS, 2021-2023 Chevrolet Camaro, and multiple Buick, GMC, Pontiac, Saturn, and Saab applications. This part cross-references DENSO Auto Parts 4718 and Anchor 9300 for the same application.

What It Helps Address

• Rough idle caused by worn or fouled spark plugs
• Hard starting from weakened ignition output
• Misfire conditions tied to incorrect plug gap or wear
• Reduced throttle response from inconsistent spark delivery
• Service interval replacement for OE-recommended maintenance

Installation Notes and Tips

Verify the engine application against the vehicle’s service information before installation. Confirm the specified gap and seat type for the listed fitment, and inspect the ignition coil, boots, and threads during service. Use the correct torque procedure for tapered-seat spark plugs to help prevent damage and ensure proper sealing.

Quality Assurance

NGK is a major OE spark plug supplier in North America with more than 80 years of automotive manufacturing experience. The brand’s OE-focused production standards and broad vehicle coverage support consistent quality for factory-style ignition service.