NGK 54240 Spark Plug Wire Set

NGK Spark Plug Wire Set for Mercedes-Benz

Restore consistent ignition performance with the NGK Spark Plug Wire Set, part number 54240. Built with blue silicone insulation, a tinned copper core, and noise suppression, this specific-fit wire set is made for select Mercedes-Benz applications from the late 1980s and early 1990s.

NGK Spark Plug Wire Set 54240 is part of NGK’s ignition product line, which draws on decades of OE-focused automotive experience. For drivers searching for a Mercedes-Benz 300E spark plug wire set, 190E ignition wire replacement, or a specific-fit NGK wire set for classic Mercedes-Benz models, this part is built around the needs of the original application.

Key Features

• Blue silicone insulation for heat resistance and durability
• Tinned copper core for stable electrical conductivity
• Noise suppression type included
• Specific-fit design for direct application matching
• 7.00 mm insulation outside diameter
• NGK part number 54240 / RC-EUC041

Detailed Description

This NGK Spark Plug Wire Set is engineered for ignition systems that require dependable spark delivery and reduced electrical interference. The silicone insulation helps protect the wires in demanding underhood conditions, while the tinned copper core supports consistent current transfer to the spark plugs. As a specific-fit replacement, it is matched to select Mercedes-Benz 190E, 260E, 300E, 300CE, 300SE, 300SEL, and 300TE models.

Compatible vehicle coverage includes Fits 1987-1993 Mercedes-Benz 190E, N/A; Fits 1986-1993 Mercedes-Benz 300E, N/A; Fits 1988-1993 Mercedes-Benz 300TE, N/A; Fits 1988-1991 Mercedes-Benz 300SE, N/A; Fits 1988-1991 Mercedes-Benz 300SEL, N/A; Fits 1987-1989 Mercedes-Benz 260E, N/A; and Fits 1988-1989 Mercedes-Benz 300CE, N/A. This part cross-references Dorman - HELP 54240 for the same application.

Common Issues This Part May Address

• Misfires caused by worn or damaged ignition wires
• Hard starting from weak spark transfer
• Rough idle from inconsistent ignition output
• Radio or electrical noise related to aging suppression components
• Cracked insulation from heat and age

Installation Notes and Tips

Before installation, compare each lead length and terminal end to the removed set to confirm routing. Keep the wires separated and routed as originally installed to reduce crossfire and maintain proper firing order. Inspect spark plugs, distributor components, and coil connections at the same time to avoid repeat ignition faults. For Mercedes-Benz 300E spark plug wire set replacement jobs and other classic Mercedes-Benz ignition service, verify the engine application against the vehicle’s original equipment layout.

Quality Assurance

NGK is known for OE-focused ignition components and global automotive manufacturing experience. Part number 54240 is produced to meet durability and operational performance expectations aligned with original-equipment standards for the listed applications.