NGK 54401 Spark Plug Wire Set

NGK Spark Plug Wire Set for Mercedes-Benz 300SEL

The NGK Spark Plug Wire Set 54401 is a specific-fit ignition wire set built for select Mercedes-Benz 300SEL applications. It uses blue silicone insulation, a tinned copper core, and noise suppression to support stable spark delivery and cleaner ignition performance.

Key Features

• Specific-fit spark plug wire set for confirmed Mercedes-Benz 300SEL applications
• Blue silicone insulation for heat resistance and durability
• Tinned copper core for reliable conductivity
• Noise suppression type included
• 7.00 mm insulation outside diameter
• NGK part number 54401 / RC-EUC047

Product Details

NGK Spark Plug Wire Set 54401 is part of NGK’s ignition product line, which includes spark plugs, glow plugs, ignition coils, coil-on-plug boots, and wire sets. Built with NGK’s OE-focused manufacturing approach, this wire set is intended for direct replacement on select Mercedes-Benz 300SEL models, including 1970-1972 Mercedes-Benz 300SEL and 1973 Mercedes-Benz 300SEL with push-in type distributor cap. This part cross-references Four Seasons 54401 for the same application.

Common Issues This Part Can Address

• Misfires caused by worn or damaged ignition wires
• Hard starting related to weak spark transfer
• Intermittent ignition noise affecting system performance
• Cracked or heat-aged wire insulation
• Voltage loss across deteriorated plug wires

Installation Notes and Tips

Verify distributor cap style before ordering, especially on 1973 Mercedes-Benz 300SEL applications with a push-in type distributor cap. Match each wire to the correct cylinder routing and confirm secure terminal engagement at the spark plug and distributor connections. Inspect related ignition components, including plugs and cap, before installation to help restore consistent ignition performance.

Quality Assurance

NGK manufactures ignition components to OE-level durability and operational standards, drawing on more than 80 years of automotive experience and broad OE expertise across global vehicle applications. The 54401 spark plug wire set reflects that focus on fit, conductivity, and long-term ignition reliability.